A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and each of these equal to 3/4 of the angle of the prism. The angle of deviation is
A
45∘
B
39∘
C
20∘
D
30∘
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Updated on : 2022-09-05
Solution
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Correct option is D)
Given:
Angle of incident i= Angle of emergence =43A
Where , A= Angle of prism
Since prism is equilateral A=60
∴i=e=60∘×43=45∘
From prism formula:
Angle of deviation , δ=i+e−A=45+45−60=30o
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