The angle of deviation ( δ ) vs angle of incidence (i) is plotted for a prism.Pick up the correct statements
A
The angle of prism is 60º
B
The refractive index of the prism is n = 
C
For deviation to be 65º the angle of incidence i 1 = 55º
D
The curve of ' δ ' vs 'i' is parabolic.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, c)
δ = i + e – A (for minimum deviation i = e)
∴ minimum deviation = 2i – A
60 0 = 2 × 60º – A ⇒ A = 60 0
µ = 
= 
= 
δ 1 = i 1 + e – A
65 0 = i 1 + 70 0 – 60 0 or i 1 = 55 0
the δ versus i curve is not parabolic
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