Question

1. The refractive indices of water and glass are 4/3 and
3/2 respectively. Find the speed of light in each.
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Answer 1

Answer:

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Answer 2

Given :

➾ Refractive index of water = 4/3

➾ Refractive index of glass = 3/2

To Find :

➨ Speed of light in each medium.

Concept :

➠ Refractive index of a medium is defined as the ratio of speed of light in vacuum to the speed of light in medium..

➠ It is an unitless as well as dimensionless quantity.

Mathematically,

✭ n = c / v

where,

➛ c denotes speed of light in vacuum

➛ v denotes speed of light in medium

➛ n denotes refractive index of medium

Calculation :

◈ Speed of light in water :

⇒ n = c / v

⇒ 4/3 = 3×10^8

8

/ v

⇒ v = 2.25 × 10^8

8

m/s

◈ Speed of light in glass :

⇒ n' = c / v'

⇒ 3/2 = 3×10^8

8

/ v'

⇒ v' = 2 × 10^8

8

m/s