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Question: A light ray is incident at almost 90º on the inclined face. Find the deviation suffered by after it ...

A light ray is incident at almost 90º on the inclined face. Find the deviation suffered by after it passes through prisms for second time –

A

600

B

300

C

900

D

1800

Answer

900

Explanation

Solution

sin 900 =23\frac { 2 } { \sqrt { 3 } }sin qc

sin qc =32\frac { \sqrt { 3 } } { 2 } ̃ qc = 600

300+ 900– qc + 900+ r = 1800

r = qc – 300 = 300

\ r1 = 300 – r = 00

so light will emerge out normally