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 –
Text Solution
Verified by ExpertsThe correct answer is:
C
sin 90 0 = 
sin θ c
sin θ c = 
⇒ θ c = 60 0 30
0 + 90 0 – θ c + 90 0 + r = 180 0 r = θ c – 30
0 = 30 0 ∴ r 1 = 30
0 – r = 0 0
so light will emerge out normally
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