Question

the absolute refractive index of water is 1.36 . find the velocity of light in the water (velocity of light in vaccum is 3x10^8)

Answer 1

Answer:

Given:

Velocity of light in vacuum =3 × 10^8 m/s

Absolute refractive index of water

= 1.36

To find:

Velocity of light in water.

Concept:

Light is an electromagnetic wave. It doesn't require a material media to propagate.

But it's wavelength changes in different media and hence its velocity also changes.

Calculation:

Let refractive index be denoted be μ

μ =

$\frac{vel. \: in \: vacuum}{vel. \: in \: media}$

=> vel. in media = vel. in vacuum/μ

=> vel. in water = (3 × 10^8) /1.36

=> vel. in water = 2.205 × 10^8 m/s

Answer 2

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Answer in attachment file.