Question Paper
Class / Subject: Class 10 (ICSE) · Physics
Chapter: Chapter 4 — Chapter 4: Refraction of Light at Plane Surfaces
Time Allowed: 32 minutes
Max Marks: 16
1. What is refraction? [1]
(A) Bending of light between different media
(B) Light travelling in a straight line always
(C) Reflection of light
(D) Absorption of light
2. Why does refraction occur? [1]
(A) Light travels at different speeds in different media
(B) Light never changes speed
(C) Light always travels the same speed
(D) No specific reason
3. What does Snell's law state? [1]
(A) sin(i)/sin(r) = constant (refractive index)
(B) sin(i) = sin(r) always
(C) i = r always
(D) No relationship exists
4. What does refractive index indicate? [1]
(A) How much light bends and slows
(B) Only the colour of light
(C) Only the light's brightness
(D) Nothing specific
5. What is total internal reflection? [1]
(A) Light reflecting entirely at denser-to-rarer boundary beyond critical angle
(B) Light always reflecting
(C) Light never reflecting
(D) A type of absorption
6. What is required for total internal reflection? [1]
(A) Angle greater than critical angle, denser to rarer medium
(B) Any angle at any boundary
(C) Only a rarer to denser medium
(D) No specific condition
7. Where is total internal reflection used? [1]
(A) Optical fibres
(B) Only mirrors
(C) Only prisms
(D) Nowhere practical
8. Why learn about refraction? [1]
(A) To understand how light behaves crossing media
(B) No reason
(C) It's not useful
(D) Only for tests
9. What is refraction? [1]
(A) Bending of light between different media
(B) Light travelling in a straight line always
(C) Reflection of light
(D) Absorption of light
10. Why does refraction occur? [1]
(A) Light travels at different speeds in different media
(B) Light never changes speed
(C) Light always travels the same speed
(D) No specific reason
11. What does Snell's law state? [1]
(A) sin(i)/sin(r) = constant (refractive index)
(B) sin(i) = sin(r) always
(C) i = r always
(D) No relationship exists
12. What does refractive index indicate? [1]
(A) How much light bends and slows
(B) Only the colour of light
(C) Only the light's brightness
(D) Nothing specific
13. What is total internal reflection? [1]
(A) Light reflecting entirely at denser-to-rarer boundary beyond critical angle
(B) Light always reflecting
(C) Light never reflecting
(D) A type of absorption
14. What is required for total internal reflection? [1]
(A) Angle greater than critical angle, denser to rarer medium
(B) Any angle at any boundary
(C) Only a rarer to denser medium
(D) No specific condition
15. Where is total internal reflection used? [1]
(A) Optical fibres
(B) Only mirrors
(C) Only prisms
(D) Nowhere practical
16. Why learn about refraction? [1]
(A) To understand how light behaves crossing media
(B) No reason
(C) It's not useful
(D) Only for tests