A ray of light strikes a plane mirror at an angle of incidence i. Determine...

WAEC 1992

A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.

A. i
B. 2i
C. 90^o-i
D. 90^o+ i
E. 180^o - 2i

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Correct Answer: Option E

Explanation

the angle of deviation = 180 - the angle of incidence - the angle of reflection

but angle of incidence = angle of reflection(snell's law)

then angle of deviation = 180 - 2i

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A ray of light strikes a plane mirror at an angle of incidence i. Determine...

Correct Answer: Option E

Explanation

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