Human Eye and the Colourful World MCQ Quiz - Multiple Choice Questions & Answers Page 2

11. Fibre optics work on the principle of

1. Scattering of light
2. Total internal reflection
3. Total internal absorption
4. Optical rotation

12. For which of the following cases will the total internal reflection of light be possible?

1. Angle of incidence is less than the critical angle.
2. Angle of incidence is equal to the critical angle.
3. Angle of incidence is greater than the critical angle.
4. Angle of incidence is equal to the angle of refraction.

13. If the angle of incidence of light while leaving the denser object is zero, the light would

1. be reflected back
2. go straight without any refraction
3. be refracted
4. end up at the boundary of the object

14. In absence of atmosphere, the colour of sky appears

1. blue
2. black
3. red
4. yellow

15. Mirage is an example of

1. reflection of light and refraction of light
2. dispersion of light
3. total internal reflection
4. refraction of light and total internal reflection

16. Mirage is formed because:

1. air above the ground is very hot and air above is cooler
2. both a and d are correct
3. light rays from a distant object bend towards the normal when coming towards the ground.
4. light rays from a distant object bend away from the normal when coming towards the ground.

17. Mirages are common in

1. rainforests
2. dry forests
3. deserts
4. highlands

18. Name the scientist who was the first to use a glass prism to obtain the spectrum of sunlight.

1. Isaac Newton
2. Einstein
3. Kepler
4. Hans Christian Oersted

19. One cannot see through the fog, because

1. refractive index of the fog is very high
2. light suffers total reflection at droplets
3. fog absorbs light
4. light is scattered by the droplets

20. Rainbows are created by sunlight

1. water particles
2. wind
3. dust particles
4. snow