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A plate with plane parallel faces having...

A plate with plane parallel faces having refractive index `1.8` rests on a plane mirror. A light ray is incident on the upper face of the plate at `60^@.` How far from the entry point will the ray emerge after reflection by the mirror. The plate is `6cm` thick?

Text Solution

Verified by Experts

The correct Answer is:
C
`mu=sin i/sin r`

`1.8=sin60^@/sinr`
Solving, we get
`r=28.8^@`
`MP=PQ tanr`
`:. MN=2(MP)=2PQ.tanr`
`=2xx6xxtan 28.8^@`
`=6.6 cm`
`mu=sin 45^@/sinr=4/3`
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