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Question
An isosceles totally reflecting prism can reflect rays through an angle of :
Options
60°
90°
180°
both 90° and 180°
MCQ
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Solution
Both 90° and 180°
Explanation:
A right-angled isosceles prism can turn a ray through 90° by one total internal reflection. Two successive total internal reflections can turn it through 180°. Hence, both angles are possible.
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