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# A ray of light is incident at an angle of ${60}^{\mathrm{o}}$  on one face of a prism of angle ${30}^{\mathrm{o}}$ . The ray emerging out of the prism makes an angle of  ${30}^{\mathrm{o}}$ with the incident ray. The emergent ray is

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a
Normal to the face through which it emerges
b
Inclined at  30o to the face through which it emerges
c
Inclined at 60o  to the face through which it emerges
d
None of the above

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detailed solution

Correct option is A

i=60oA=30oD=30oD=i1+i2−A30=60+i2−30i2=0  it comes out normally.

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