A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change?

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A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change?

Class 10 | ICSE | Physics | Refraction of Light at Plane Surfaces | Selina

A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change?

Solution:

Water has a refractive index of 1.33.

Air has a refractive index of 1.0003.

Glass has a refractive index of 1.5.

This shows that

μ_{a <}μ_{w <}μ_g

When light travels from a rarer to a denser medium, its speed drops, and it increases when it travels from a denser to a rarer media.

As a result, when a light ray crosses from water to air, the speed of light increases, and when the light ray passes from water to glass, the speed of light drops.

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