Question

# A ray of light is incident at an angle of 60∘ on one face of a prism of angle 30∘. The emergent ray of light makes an angle of 30∘ with incident ray. The angle made by the emergent ray with second face of prism will be:

A
30
B
90
C
0
D
45
Solution
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#### The correct option is B90∘Here, i1=60oA=30oδ=30oSince, δ=i1+i2−A 30=60o+i2−30o i2=0So from the surface, it will make 90o.

4
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