Question

The refractive index of water is 1.33. The speed of light in water will be
(a) 1.33 × 108 m/s
(b) 3 × 108 m/s
(c) 2.26 × 108 m/s
(d) 2.66 × 108 m/s

Answer 1

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Answer 2

The refractive index of water is 1.33. The speed of light in water will be (c) 2.26 × 10^8 m/s

Given

R.I of water= 1.33

To Find

The speed of light in water

Solution -

Refractive index= Speed of light in vacuum / Speed of light in water

n= 1.33

v=3*10^8.

It is denoted as

c= n/v

v=c/n=3*10^8/1.33

        =2.26 × 10^8 m/s

The speed of light in water will be 2.26 × 10^8 m/s.