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Question

Which of the following graphs correctly represents the variation of angle of deviation (δ) with the variation in angle of incidence i for a plane mirror?

A
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B
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C
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D
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Solution

The correct option is C

From the above diagram, we can deduce that,
δ=(180(i+r)) degrees=(π(i+r)) rad

From the law of reflection,

i=r

So, we can rewrite the above equation as, δ=π2i

Comparing this with y=mx+c , we can clearly say that, the graph between angle of deviation and angle of incidence is a straight line having a negative slope. Also, its intercepts are at (0,π) and (π2,0)


Why this Question?This question provides more understanding to a student about angle of deviation.Note:- Go through the definition of angle of deviation and its formula.

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