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Refraction and TIR Questions

Q1. Which of the following is correct when total internal reflection occurs?

A
 The angle of incidence is less than the critical angle.
B
 The light meets an optically less dense medium.
C
The light enters a medium with a higher refractive index.
D
 The angles that the incident and refracted rays make with the normal are the same.

 

Q2. Calculate the speed of light in glass of refractive index 1.42

A
4.26 × 107 m s–1
B
2.11 × 108 m s–1
C
3.00 × 108 m s–1
D
4.73 × 108 m s–1

 

Q3. The diagram below shows a ray of light travelling in air and incident on a glass block of refractive index 1.5

What is the angle of refraction in the glass?

A
22.5°
B
23.3°
C
33.1°
D
59.4°