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A ray of light in incident on a glass pl...

A ray of light in incident on a glass plate at an angle of `60^@`. What is the refractive index of glass if the reflected and refracted rays are perpendicular to each other?

A

`sin i`

B

`cos i`

C

`tan i`

D

`"cosec" i`

Text Solution

Verified by Experts

The correct Answer is:
C

`angleCBD=90^(@):. i+r=90^(@) " " :. r=90-i`
`:. n=(sin i)/( sin r)=( sin i)/(sin(90-i))=(sin i)/(cos i)= tan i`
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