Critical angle for a medium is $45 °$ . Find the value of refractive index of the medium?

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1.41 °

1.45 °

1.21 °

1.81 °

answer is A.

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Detailed Solution

The value of refractive index of the medium is

1.41 ° .

Refractive index is a measure of the refraction of light rays as they pass from one medium to another. It is also the ratio of the speed of light in a vacuum to the speed of light in a particular medium.
Using the formula,

μ = \frac{1}{\sin \sin C}

= \frac{1}{\sin \sin 45 °}

= 1.41 °

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