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A rectangular block of glass ABCD has a ...

A rectangular block of glass `ABCD` has a refractive index `1.6`. A pin is placed midway on the face`AB`, Fig. When observed from the face `AD`, the pin shall.
.

A

appear to be near `A`.

B

appear to be near `D`

C

appear to be at the centre of `AD`

D

not bee seen at all.

Text Solution

Verified by Experts

The correct Answer is:
A, D
In Fig., a pin is held at `L`, mid point of `AB`. When seen from face `AD` (so long as I lt C) image of `L` appears to be at `L'`, closer to `A`.
From `sin C = (1)/(mu) = (1)/(1.6) = 0.625, C = sin^-1(0.625) = 38.7^@`
So when angle of incidence becomes greater than `C(= 38.7^@)`, the rays starting from `L` will undergo totalinternal refection and pin shall not be seen at all.
The choice (a) and (d) are correct.
.
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