Speed of light in vacuum is 3 x 10⁸ m/s. Its speed in water will be :

[Given refractive index of water is 4/3]

1. 3 x 10⁸ m/s
2. 2.25 x 10⁸ m/s
3. 2.5 x 10⁸ m/s
4. 4 x 10⁸ m/s

The refractive index of water is 4/3 and that of glass is 3/2. The refractive index of glass with respect to water is:

1. 9/8
2. 2
3. 8/9
4. 1

With respect to light passing from air into water, which of the following statements is correct?

1. Angle of incidence is equal to the angle of refraction.
2. Angle of incidence is always greater than the angle of refraction
3. Angle of incidence is always less than the angle of refraction
4. Angle of incidence has no effect on the angle of refraction.

A ray of light is incident normally on a plane glass slab. What will be (i) the angle of refraction and (ii) the angle of deviation for the ray?