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A ray of light in air is incident on a...

A ray of light in air is incident on a glass slab at an angle of incidence of `60^(@)`. When it travels through glass, it is deviated through ` 15^(@)`. What is the refractive index of the material of the glass slab ?

A

`1.275`

B

`1.225`

C

`1.8`

D

`1.5`

Text Solution

Verified by Experts

The correct Answer is:
B
Deviation of the ray ` delta=i-r :. 15^(@)=60^(@)-r :. r=45^(@)`
`:. n=(sin 60^(@))/(sin 45^(@))=((sqrt(3))/(2))/((1)/(sqrt(2)))=(sqrt(3))/(2) xx (sqrt(2))/1=sqrt((3)/2)=1.225`
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Knowledge Check

  • A ray of light is incident on a glass slab at an angle of 45^(@) . If refractive index of glass be 1.6, what is the angle of refraction ?

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