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The principal section of a glass prism i...

The principal section of a glass prism is an isosceles triangle ABC with AB = AC. The face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle BAC of the prism’ is

A

`30^@`

B

`36^@`

C

`18^@`

D

`72^@`

Text Solution

Verified by Experts

The correct Answer is:
B
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Incident ray on one of the face (AB) of a prism and emergent ray from the face AC are given in figure. Complete the ray diagram.

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