Question

In the figure shown, for an angle of incidence 45, at the top surface, what is the minimum refractive index needed for total internal reflection at vertical face AD?

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A

B

C

D

Hard
Solution
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Correct option is B)

To find:
Minimum R.I
so that TIR
takes place at AD=?
For TIR
Applying snesll's Law at Ab
............(1)
Applying snell's law at AD
............(2)
From eq (1) and (2)
from eq (1)

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