Question

Calculate the refractive index of the material of a glass slab. Given
that the speed of light through the glass slab is 2 x 10 ki 8 m/s and in
air is 3 x 10 ki power 8 m/s.​

Answer 1

Answer:

n = c/v = velocity of light in vaccum / velocity of light through denser media ( slab )

=> n ( Refractive index ) = 3*10^8 / 2*10^8

=> n = 3/2

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Answer 2

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Given :

• Speed of Light in glass slab is 2 × 10^8 m/s
• Speed of light in air = 3 × 10^8 m/s

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To Find :

• Refractive Index

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Solution :

Formula for Refractive Index is :

$\large {\boxed{\sf{\mu \: = \: \dfrac{Speed \: in \: Air}{Speed \: in \: medium}}}} \\ \\ \implies {\sf{\mu \: = \: \dfrac{2 \: \times \: 10^8}{3 \: \times \: 10^8}}} \\ \\ \implies {\sf{\mu \: = \: \dfrac{3}{2}}} \\ \\ \implies {\sf{\mu \: = \: 1.5}}$

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• Refractive index is defined as ratio of speed of light in air to medium.

• Denoted by μ (mu) .

• It have no units means unit less.