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One side of a glass slab is silvered as ...

One side of a glass slab is silvered as shown in the figure. A ray of light is incident on the other side at angle of incidence `45^@.` Refractive index of glass is given as `sqrt2`. The deflection suffered by the ray when it comes out of the slab is

A

`90^@`

B

`180^@`

C

`120^@`

D

`45^@`

Text Solution

Verified by Experts

The correct Answer is:
A
`mu=sin i/sin r rArr sqrt2=sin45^@/sin r or r=30^@`

`delta_(Total)=delta_A-delta_B+delta_C`
`=(45^@-30^@)-[180^@-2(30^@)]+(45^@-30^@)`
`=-90^@ or |delta_(Total)|=90^@`
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Knowledge Check

  • One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence i=45^(@) . Refractive index of glass is given as 1.5 . The deviation of the ray of light from its initial path when it comes out of the slab is

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