SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions | Assam Eduverse
SEBA Class 10 Science Chapter 9 Heredity and Evolution Important Extra Questions are prepared to help students understand inheritance patterns and evolutionary concepts for the HSLC examination. These SEBA Class 10 Science Chapter 9 Heredity and Evolution Important Extra Questions include theory-based questions, numerical problems, previous year questions (PYQs), and important MCQs.
The SEBA Class 10 Science Chapter 9 Heredity and Evolution Important Extra Questions strictly follow the latest SEBA (ASSEB) syllabus for 2026–27. Since students must attempt 45 MCQs in the HSLC Science examination, practising MCQs from SEBA Class 10 Science Chapter 9 Heredity and Evolution Important Extra Questions is essential.
Topics covered in SEBA Class 10 Science Chapter 9 Heredity and Evolution Important Extra Questions include Mendel’s experiments, dominant and recessive traits, genotype and phenotype, sex determination, acquired and inherited traits, and evolutionary relationships. Students searching for HSLC Science Chapter 9 Heredity and Evolution Important Questions or SEBA Class 10 Science Chapter 9 PYQs will find this resource highly beneficial.
SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions
Table of Contents
A. Previous Year Questions with Answers
Q1. Where should an object be placed in front of a convex lens to get a real image of the size of the object? [HSLC 2019, 2022]
(i) At infinity
(ii) At twice the focal length
(iii) At infinity
(iv) Between the optical centre of the lens and its principal focus
Answer: (ii) At twice the focal length
Q2. Which of the following lenses would you prefer to use while reading small letters printed in a dictionary? [HSLC 2020]
(i) A convex lens of focal length 50 cm
(ii) A concave lens of focal length 50 cm
(iii) A convex lens of focal length 5 cm
(iv) A concave lens of focal length 5 cm
Answer: (iii) A convex lens of focal length 5 cm
Q3. If the refractive index of glass is 1.5, then speed of light in glass is – [HSLC 2021]
(i) 2 × 10⁸ m/s
(ii) 3 × 10⁵ m/s
(iii) 2.25 × 10⁸ m/s
(iv) 3 × 10⁸ m/s
Answer: (i) 2 × 10⁸ m/s
Q4. The focal length of a lens is 1 meter. Its power is – [HSLC 2023]
(i) 0.5 D
(ii) 1 D
(iii) 1.5 D
(iv) 2 D
Answer: (ii) 1 D
Q5. Image formed by a concave mirror is – [HSLC 2023]
(i) real and diminished
(ii) real and enlarged
(iii) virtual and enlarged
(iv) virtual and diminished
Answer: (ii) real and enlarged
Q6. A spherical mirror and a thin spherical lens have each a focal length of –15 cm. The mirror and the lens are likely to be [HSLC 2024]
(A) both convex
(B) both concave
(C) the mirror is concave and the lens is convex
(D) the mirror is convex and the lens is concave
Answer: (B) both concave
Q7. The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object? [HSLC 2024]
(A) Between the principal focus and the centre of curvature
(B) At the centre of curvature
(C) Beyond the centre of curvature
(D) Between the pole of the mirror and its principal focus
Answer: (D) Between the pole of the mirror and its principal focus
Q8. The SI unit of power of a lens is [HSLC 2024]
(A) joule
(B) dioptre
(C) ohm
(D) ampere
Answer: (B) dioptre
Q9. A student conducts an activity using a concave mirror with focal length of 10 cm. He places an object 15 cm from the mirror. Where is the image likely to form? [HSLC 2025]
(a) At 6 cm behind the mirror
(b) At 30 cm behind the mirror
(c) At 6 cm in front of the mirror
(d) At 30 cm in front of the mirror
Answer: (d) At 30 cm in front of the mirror
B. Extra Questions with Answers
Q.1. The image formed by a plane mirror is always —
(i) real and inverted
(ii) virtual and erect
(iii) real and erect
(iv) virtual and inverted
Answer: (ii) virtual and erect
Q.2. The principal focus of a concave mirror is the point where the rays parallel to the principal axis —
(i) appear to diverge
(ii) meet after reflection
(iii) get absorbed
(iv) become perpendicular
Answer: (ii) meet after reflection
Q.3. The relationship between radius of curvature (R) and focal length (f) of a spherical mirror is —
(i) R = f
(ii) R = 2f
(iii) R = f/2
(iv) R = 4f
Answer: (ii) R = 2f
Q.4. When an object is placed between the pole and principal focus of a concave mirror, the image formed is —
(i) real, inverted and diminished
(ii) real, inverted and enlarged
(iii) virtual, erect and enlarged
(iv) virtual, inverted and diminished
Answer: (iii) virtual, erect and enlarged
Q.5. The mirror formula for spherical mirrors is —
(i) 1/f = 1/v – 1/u
(ii) 1/f = 1/u + 1/v
(iii) 1/f = u + v
(iv) f = uv
Answer: (ii) 1/f = 1/u + 1/v
Q.6. A convex mirror is preferred as a rear-view mirror because —
(i) it forms real and magnified image
(ii) it forms virtual and diminished image with wider field of view
(iii) it forms inverted image
(iv) it forms image at infinity
Answer: (ii) it forms virtual and diminished image with wider field of view
Q.7. Assertion (A): A ray passing through the centre of curvature of a concave mirror retraces its path after reflection.
Reason (R): The ray strikes the mirror normally at the centre of curvature.
(i) Both A and R are true and R is the correct explanation of A
(ii) Both A and R are true but R is not the correct explanation of A
(iii) A is true but R is false
(iv) A is false but R is true
Answer: (i) Both A and R are true and R is the correct explanation of A
Q.8. When light passes obliquely from a rarer medium to a denser medium, it —
(i) bends away from the normal
(ii) bends towards the normal
(iii) goes undeviated
(iv) gets totally reflected
Answer: (ii) bends towards the normal
Q.9. The refractive index of a medium is defined as —
(i) v/c
(ii) c/v
(iii) u/v
(iv) v/u
Answer: (ii) c/v
Q.10. When a convex lens is used to focus sunlight on a piece of paper and a sharp bright spot is obtained, that spot represents —
(i) virtual image of the Sun
(ii) centre of curvature
(iii) real image of the Sun at principal focus
(iv) optical centre
Answer: (iii) real image of the Sun at principal focus
Q.11. When an object is placed at the centre of curvature of a concave mirror, the image formed is —
(i) real, inverted and enlarged
(ii) real, inverted and same size
(iii) virtual and erect
(iv) highly diminished
Answer: (ii) real, inverted and same size
Q.12. The diameter of the reflecting surface of a spherical mirror is called its —
(i) radius of curvature
(ii) principal axis
(iii) aperture
(iv) focal length
Answer: (iii) aperture
Q.13. A ray parallel to the principal axis, after reflection from a convex mirror —
(i) passes through the focus
(ii) appears to diverge from the principal focus
(iii) passes through centre of curvature
(iv) retraces its path
Answer: (ii) appears to diverge from the principal focus
Q.14. According to the New Cartesian Sign Convention, all distances measured to the right of the pole are taken as —
(i) negative
(ii) zero
(iii) positive
(iv) infinity
Answer: (iii) positive
Q.15. Assertion (A): The image formed by a concave mirror at infinity is highly enlarged.
Reason (R): When the object is at the focus of a concave mirror, the image is formed at infinity.
(i) Both A and R are true and R is the correct explanation of A
(ii) Both A and R are true but R is not the correct explanation of A
(iii) A is false but R is true
(iv) Both A and R are false
Answer: (iii) A is false but R is true
Q.16. When a ray of light is incident normally on the surface separating two media, it —
(i) bends towards the normal
(ii) bends away from the normal
(iii) suffers no deviation
(iv) undergoes total internal reflection
Answer: (iii) suffers no deviation
Q.17. The refractive index of water is 1.33. This means that —
(i) speed of light in water is 1.33 times that in air
(ii) speed of light in air is 1.33 times that in water
(iii) speed of light in vacuum is less than in water
(iv) water is optically rarer than air
Answer: (ii) speed of light in air is 1.33 times that in water
Q.18. The image formed by a convex mirror is always —
(i) real and inverted
(ii) real and diminished
(iii) virtual and erect
(iv) virtual and enlarged
Answer: (iii) virtual and erect
Q.19. The lens formula for spherical lenses is —
(i) 1/f = 1/u + 1/v
(ii) 1/f = 1/v – 1/u
(iii) 1/v – 1/u = 1/f
(iv) f = u + v
Answer: (iii) 1/v – 1/u = 1/f
Q.20. If the power of a lens is –2 D, the lens is —
(i) convex
(ii) concave
(iii) plane
(iv) cylindrical
Answer: (ii) concave
Q.21. The principal axis of a spherical mirror is the straight line joining the —
(i) focus and pole
(ii) pole and centre of curvature
(iii) focus and centre of curvature
(iv) aperture and pole
Answer: (ii) pole and centre of curvature
Q.22. When an object is placed between F and C of a concave mirror, the image formed is —
(i) real, inverted and enlarged
(ii) real, erect and enlarged
(iii) virtual and diminished
(iv) virtual and inverted
Answer: (i) real, inverted and enlarged
Q.23. In a rectangular glass slab, the emergent ray is parallel to the incident ray because —
(i) the slab absorbs light
(ii) the angles of incidence and reflection are equal
(iii) the refractions at the two parallel surfaces are equal and opposite
(iv) the refractive index is zero
Answer: (iii) the refractions at the two parallel surfaces are equal and opposite
Q.24. The absolute refractive index of a medium is given by —
(i) v/c
(ii) c/v
(iii) v₁/v₂
(iv) sin r/sin i
Answer: (ii) c/v
Q.25. Assertion (A): A convex lens converges parallel rays of light.
Reason (R): A convex lens is thicker at the edges than at the middle.
(i) Both A and R are true and R is the correct explanation of A
(ii) Both A and R are true but R is not the correct explanation of A
(iii) A is true but R is false
(iv) A is false but R is true
Answer: (iii) A is true but R is false
Q.26. The power of a lens is +2 D. Its focal length is —
(i) 0.5 m
(ii) 2 m
(iii) –0.5 m
(iv) –2 m
Answer: (i) 0.5 m
Q.27. A ray passing through the optical centre of a lens —
(i) emerges parallel to principal axis
(ii) passes without deviation
(iii) bends towards focus
(iv) gets reflected back
Answer: (ii) passes without deviation
Q.28. When an object is placed at infinity in front of a convex lens, the image is formed —
(i) at optical centre
(ii) at focus
(iii) between F and 2F
(iv) at infinity
Answer: (ii) at focus
Q.29. Match the following:
Column I
(a) Concave mirror
(b) Convex mirror
(c) Convex lens
(d) Concave lens
Column II
(i) Always forms virtual, erect and diminished image
(ii) Used as shaving mirror
(iii) Used as rear-view mirror
(iv) Converges parallel rays
Choose the correct matching —
(i) a–ii, b–iii, c–iv, d–i
(ii) a–iii, b–ii, c–i, d–iv
(iii) a–iv, b–i, c–ii, d–iii
(iv) a–i, b–iv, c–iii, d–ii
Answer: (i) a–ii, b–iii, c–iv, d–i
Q.30. When light travels from a denser medium to a rarer medium, it —
(i) bends towards the normal
(ii) bends away from the normal
(iii) suffers no deviation
(iv) gets absorbed
Answer: (ii) bends away from the normal
Q.31. When an object is placed at the principal focus of a concave mirror, the image formed is —
(i) at the centre of curvature
(ii) between F and C
(iii) at infinity
(iv) behind the mirror
Answer: (iii) at infinity
Q.32. The magnification produced by a spherical mirror is given by —
(i) m = h/h′
(ii) m = v/u
(iii) m = –v/u
(iv) m = u/v
Answer: (iii) m = –v/u
Q.33. Assertion (A): Light travels faster in air than in glass.
Reason (R): Glass is optically denser than air.
(i) Both A and R are true and R is the correct explanation of A
(ii) Both A and R are true but R is not the correct explanation of A
(iii) A is true but R is false
(iv) A is false but R is true
Answer: (i) Both A and R are true and R is the correct explanation of A
Q.34. The optical centre of a lens is the point through which a ray of light —
(i) gets reflected
(ii) passes without deviation
(iii) bends towards focus
(iv) forms a virtual image
Answer: (ii) passes without deviation
Q.35. The SI unit of power of a lens is —
(i) metre
(ii) metre⁻¹
(iii) dioptre
(iv) centimetre
Answer: (iii) dioptre
Q.36. A concave lens always forms an image which is —
(i) real and inverted
(ii) virtual, erect and diminished
(iii) real and enlarged
(iv) virtual and enlarged
Answer: (ii) virtual, erect and diminished
Q.37. When light enters from air into glass obliquely, the angle of refraction is —
(i) greater than angle of incidence
(ii) equal to angle of incidence
(iii) less than angle of incidence
(iv) zero
Answer: (iii) less than angle of incidence
Q.38. If the focal length of a convex lens is 20 cm, its power is —
(i) +5 D
(ii) –5 D
(iii) +0.05 D
(iv) +5 D
Answer: (i) +5 D
Q.39. Match the following:
Column I
(a) Radius of curvature
(b) Focal length
(c) Refractive index
(d) Power of lens
Column II
(i) Reciprocal of focal length
(ii) R/2
(iii) c/v
(iv) Distance between pole and centre of curvature
Choose the correct matching —
(i) a–iv, b–ii, c–iii, d–i
(ii) a–ii, b–iv, c–i, d–iii
(iii) a–iii, b–i, c–iv, d–ii
(iv) a–iv, b–iii, c–ii, d–i
Answer: (i) a–iv, b–ii, c–iii, d–i
Q.40. In a convex mirror, the principal focus is located —
(i) in front of the mirror
(ii) at the pole
(iii) behind the mirror
(iv) at infinity
Answer: (iii) behind the mirror
Q.41. The centre of curvature of a concave mirror lies —
(i) behind the mirror
(ii) in front of the mirror
(iii) at the pole
(iv) at infinity
Answer: (ii) in front of the mirror
Q.42. When a pencil partly immersed in water appears bent at the surface of water, it is due to —
(i) reflection of light
(ii) dispersion of light
(iii) refraction of light
(iv) diffraction of light
Answer: (iii) refraction of light
Q.43. According to Snell’s law, the ratio sin i / sin r is constant for —
(i) any two media and any colour
(ii) a given pair of media and given colour
(iii) only vacuum
(iv) only glass
Answer: (ii) a given pair of media and given colour
Q.44. Assertion (A): A concave mirror can be used as a shaving mirror.
Reason (R): It forms a virtual, erect and enlarged image when the face is placed close to it.
(i) Both A and R are true and R is the correct explanation of A
(ii) Both A and R are true but R is not the correct explanation of A
(iii) A is true but R is false
(iv) A is false but R is true
Answer: (i) Both A and R are true and R is the correct explanation of A
Q.45. When parallel rays of light fall on a concave lens, they —
(i) converge at the focus
(ii) pass undeviated
(iii) diverge and appear to come from the principal focus
(iv) get reflected back
Answer: (iii) diverge and appear to come from the principal focus
Q.46. The focal length of a concave lens is always taken as —
(i) positive
(ii) zero
(iii) negative
(iv) infinity
Answer: (iii) negative
Q.47. A real image formed by a convex lens is always —
(i) erect
(ii) inverted
(iii) diminished only
(iv) virtual
Answer: (ii) inverted
Q.48. If the speed of light in a medium is 2 × 10⁸ m/s, its refractive index (c = 3 × 10⁸ m/s) is —
(i) 1.5
(ii) 0.67
(iii) 2.0
(iv) 3.0
Answer: (i) 1.5
Q.49. The power of a lens is –4 D. Its focal length is —
(i) –0.25 m
(ii) +0.25 m
(iii) –4 m
(iv) +4 m
Answer: (i) –0.25 m
Q.50. When an object is placed between F and optical centre O of a convex lens, the image formed is —
(i) real and inverted
(ii) real and diminished
(iii) virtual, erect and enlarged
(iv) virtual and diminished
Answer: (iii) virtual, erect and enlarged
Q.51. The radius of curvature of a spherical mirror is 40 cm. Its focal length is —
(i) 10 cm
(ii) 20 cm
(iii) 40 cm
(iv) 80 cm
Answer: (ii) 20 cm
Solution:
R = 2f
f = R/2 = 40/2 = 20 cm
Q.52. The focal length of a convex mirror is 15 cm. Its radius of curvature is —
(i) 7.5 cm
(ii) 15 cm
(iii) 30 cm
(iv) 45 cm
Answer: (iii) 30 cm
Solution:
R = 2f = 2 × 15 = 30 cm
Q.53. The power of a lens of focal length 0.5 m is —
(i) 0.5 D
(ii) 1 D
(iii) 2 D
(iv) 5 D
Answer: (iii) 2 D
Solution:
P = 1/f = 1/0.5 = 2 D
Q.54. The focal length of a lens of power –4 D is —
(i) –0.25 m
(ii) +0.25 m
(iii) –4 m
(iv) +4 m
Answer: (i) –0.25 m
Solution:
P = 1/f
f = 1/P = 1/(–4) = –0.25 m
Q.55. The refractive index of a medium is 1.5. If speed of light in vacuum is 3 × 10⁸ m/s, speed in medium is —
(i) 2 × 10⁸ m/s
(ii) 4.5 × 10⁸ m/s
(iii) 1.5 × 10⁸ m/s
(iv) 3 × 10⁸ m/s
Answer: (i) 2 × 10⁸ m/s
Solution:
n = c/v
v = c/n = (3 × 10⁸)/1.5 = 2 × 10⁸ m/s
Q.56. An object is placed 30 cm in front of a concave mirror of focal length 15 cm. Image distance is —
(i) –30 cm
(ii) –15 cm
(iii) –20 cm
(iv) –10 cm
Answer: (i) –30 cm
Solution:
1/f = 1/v + 1/u
1/–15 = 1/v + 1/–30
–1/15 = 1/v – 1/30
1/v = –1/15 + 1/30
1/v = –2/30 + 1/30 = –1/30
v = –30 cm
Q.57. If object distance u = –20 cm and image distance v = –40 cm for a mirror, magnification is —
(i) +2
(ii) –2
(iii) +0.5
(iv) –0.5
Answer: (ii) –2
Solution:
m = –v/u
m = –(–40)/(–20) = –(40/–20) = –2
Q.58. A convex lens has focal length 25 cm. Its power is —
(i) +4 D
(ii) +0.04 D
(iii) +0.25 D
(iv) +0.4 D
Answer: (iv) +0.4 D
Solution:
f = 25 cm = 0.25 m
Correction: 1/0.25 = 4 D
Q.59. The refractive index of water is 1.33. Speed of light in water is —
(i) 2.25 × 10⁸ m/s
(ii) 3 × 10⁸ m/s
(iii) 1.33 × 10⁸ m/s
(iv) 4 × 10⁸ m/s
Answer: (i) 2.25 × 10⁸ m/s
Solution:
v = c/n = (3 × 10⁸)/1.33 ≈ 2.25 × 10⁸ m/s
Q.60. A lens has power +5 D. Its focal length is —
(i) 0.2 m
(ii) 5 m
(iii) 2 m
(iv) 0.5 m
Answer: (i) 0.2 m
Solution:
f = 1/P = 1/5 = 0.2 m
Q.61. An object is placed at –10 cm in front of a convex mirror of focal length +20 cm. Image distance is —
(i) +6.67 cm
(ii) –6.67 cm
(iii) +30 cm
(iv) –30 cm
Answer: (i) +6.67 cm
Solution:
1/f = 1/v + 1/u
1/20 = 1/v – 1/10
1/v = 1/20 + 1/10
1/v = 1/20 + 2/20 = 3/20
v = 20/3 ≈ 6.67 cm
Q.62. A lens has focal length –50 cm. Its power is —
(i) –2 D
(ii) –0.02 D
(iii) –0.2 D
(iv) +2 D
Answer: (iii) –0.2 D
Solution:
f = –0.5 m
P = 1/f = 1/(–0.5) = –2 D
Correct Answer: (i) –2 D
Q.63. Magnification of a lens when v = +30 cm and u = –15 cm is —
(i) +2
(ii) –2
(iii) +0.5
(iv) –0.5
Answer: (ii) –2
Solution:
m = v/u = 30/–15 = –2
Q.64. If focal length of mirror is –10 cm, its radius of curvature is —
(i) –5 cm
(ii) –10 cm
(iii) –20 cm
(iv) +20 cm
Answer: (iii) –20 cm
Solution:
R = 2f = 2 × (–10) = –20 cm
Q.65. A lens of power –5 D has focal length —
(i) –0.2 m
(ii) +0.2 m
(iii) –5 m
(iv) +5 m
Answer: (i) –0.2 m
Solution:
f = 1/P = 1/(–5) = –0.2 m
SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions for HSLC Exam 2026–27
The SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions provided here are prepared according to the latest SEBA (ASSEB) syllabus 2026–27. These SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions include conceptual MCQs, short answer questions, long answer questions, and numerical problems aligned with the HSLC exam pattern.
As per the latest HSLC structure, students must answer 45 MCQs. Therefore, regular practice of SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions ensures strong preparation for MCQ-based and calculation-based questions.
The SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions cover mirror formula derivations, sign conventions, ray diagrams for mirrors and lenses, refraction laws, and refractive index calculations. Continuous revision using SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions improves conceptual clarity and numerical accuracy.
These Class 10 Light Reflection and Refraction Important Questions with MCQs are ideal for final revision. Consistent practice of SEBA Class 10 Science Chapter 10 Light – Reflection and Refraction Important Extra Questions strengthens exam confidence and scoring performance.
Frequently Asked Questions (FAQ)
1. Why is Chapter 10 Light – Reflection and Refraction important for HSLC exam?
This chapter includes numerical problems, ray diagrams, mirror formula, and refraction concepts frequently asked in HSLC Science exams.
2. How many MCQs are asked in HSLC Science exam?
Students must answer 45 MCQs as per the latest HSLC Science examination pattern.
3. Are MCQs included in Light – Reflection and Refraction important questions?
Yes, conceptual and numerical MCQs are included according to the updated HSLC exam structure.
4. Are these questions based on SEBA syllabus?
Yes, all questions are prepared strictly according to the latest SEBA (ASSEB) syllabus for 2026–27.
5. Do these include previous year questions?
Yes, previous year questions are included to help students understand HSLC exam trends.
6. Which topics are covered in Chapter 10?
Topics include laws of reflection, mirror formula, magnification, refraction, lenses, and ray diagrams.
7. Can practising these improve exam performance?
Yes, regular revision improves numerical accuracy, diagram clarity, and MCQ performance.
🎓 About Assam Eduverse
Assam Eduverse is the best educational platform in Assam, offering SEBA, AHSEC (ASSEB), SCERT, CBSE, and Assam Board Solutions along with study materials, notes, and exam preparation guides to help students learn smarter and score higher.
Our expert-prepared answers and MCQs follow the latest Assam Board Syllabus and NCERT Syllabus. We make learning simple, accessible, and effective for all students preparing for board or competitive exams.📘 Visit Assam Eduverse for free Assam Board Solutions, notes, and Study Materials prepared by experts.