﻿ The principle section of a glass prism is an isosceles triangle ABC with AB= AC. The face AC is silvered. A ray incident normally on face AB, after two reflections, emerges from the base BC in a direction perpendicular to it. What is the ∠BAC of the prism?  : Kaysons Education

The Principle Section Of A Glass Prism Is An Isosceles Triangle ABC with AB= AC. The Face AC is Silvered. A Ray Incident Normally On Face AB, After Two Reflections, Emerges From The Base BC in A Direction Perpendicular To It. What Is The ∠BAC Of The Prism?

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Question

Solution

Correct option is

36o

The path of the ray is shown in fig.

It is clear that

and                           β = 2α

Hence                       α = 36o.

SIMILAR QUESTIONS

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