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The speed of light in air is $3 \times 10^{8} m /$ s and that in medium $A$ is $2.5 \times 10^{8} m / s$ . The refractive index of $A$ will be

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1.2

0.5

4.5

4.1

answer is A.

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Detailed Solution

The refractive index of

A

will be

1.2 .

Given,
Speed of light in air,

c = 3 \times 10^{8} m / s

Speed of light in medium,

v = 2.5 \times 10^{8} m / s

It is known that the refractive index is given by the following relation

\Rightarrow μ = \frac{c}{v}

Where

μ

c

and

v

are the refractive index, speed of light in air and speed of light in medium respectively.
On substituting the given values, we get the refractive index as

\Rightarrow μ = \frac{3 \times 10^{8}}{2.5 \times 10^{8}}

\Rightarrow μ = 1.2

Hence, the refractive index of

A

will be

1.2 .

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