Question

What angle an incident ray should make with the surface on which it strikes exactly to retrace its path after reflection?

Answer 1

ANSWER. 90 DEGREE.

Explanation:

AS WHEN IT WILL BE PERPENDICULAR TO THE SURFACE IT STRIKES IT WILL GO BACK TO THE SAME PATH.

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Answer 2

ANSWER:

IT MAKES 90 DEGREE ANGLE

EXPLANATION:

FROM PARTIAL AND TOTAL INTERNAL REFLECTION

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