MCQ- 30 ICSE Physics class 10 ch-2 Light

Refractive Index - Numerical MCQ Quiz

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1. A light ray travels from air to water (n = 1.33). If the speed of light in air is 3x 10⁸ m/s, what is the speed in water?

2 x10⁸ m/s
2.25 x10⁸ m/s
3 x 10⁸ m/s
1.99 x 10⁸ m/s

Correct Answer: 2.26 x 10⁸ m/s

2. The refractive index of glass is 1.5. If the speed of light in air is 3 x 10⁸ m/s, what is the speed in glass?

2 x. 10⁸ m/s
1.5 x 10⁸ m/s
2.5 x 10⁸/s
1.0 m/s

Correct Answer: 2x10⁸ m /s

3. If the refractive index of diamond is 2.42, what is the critical angle of diamond?

24.4°
30.5°
45.0°
60.0°

Correct Answer: 24.4°

4. A light ray enters from air to glass (n = 1.5) at 30° incidence. What is the angle of refraction?

19.5°
25°
30°
15°

Correct Answer: 19.5°

5. If refractive index of water is 1.33, what is the wavelength of light in water if in air it is 600 nm?

450 nm
500 nm
600 nm
400 nm

Correct Answer: 450 nm