MCQ- 6 ICSE Physics class 10 ch-2 Light

Class 10 - Light Quiz (Critical Angle)

1. What is the critical angle?

The angle of incidence where light travels straight
The angle of incidence for which angle of refraction is 90°
The angle of refraction when light bends away from normal
The angle of reflection

2. Which factor affects the critical angle of light?

Colour of light (or wavelength of light)
Density of the medium
Shape of the medium
Size of the medium

3. What happens to the critical angle when the temperature of a medium increases?

It decreases
It increases
It remains the same
It turns zero

4. Which pair of media will have the smallest critical angle?

Air to water
Glass to air
Water to oil
Air to vacuum

5. Why does red light have a larger critical angle than blue light?

Red light has a higher frequency
Red light has a longer wavelength
Blue light travels slower
Red light is absorbed easily

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