Question

The refractive indexes of mediums A and B are 1.33 and 1.47 respectively . Name the medium in which the velocity of light is more?​

Answer 1

The speed of light is more in medium A because it has less refractive index.

Explanation:

Given that,

Refractive index of medium A, $n_A=1.33$

Refractive index of medium B, $n_B=1.47$

The relation between the refractive index the speed of light in a medium is given by :

$n=\dfrac{c}{v}$

c is the speed of light

Velocity of light in medium A,

$v_A=\dfrac{c}{n_A}$

$v_A=\dfrac{3\times 10^8}{1.33}$

$v_A=2.25\times 10^8\ m/s$

Velocity of light in medium B,

$v_B=\dfrac{c}{n_B}$

$v_B=\dfrac{3\times 10^8}{1.47}$

$v_B=2.04\times 10^8\ m/s$

The speed of light is more in medium A because it has less refractive index. Hence, this is the required solution.

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Topic : Refractive index

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