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Q.

When one light ray is reflected from a plane mirror with $30^{0}$ angle of reflection, the angle of deviation of the ray after reflection is

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answer is 120.

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Detailed Solution

$i = 30^{0}$

After reflection
Angle of deviation
$δ = 180 - 2 i = 180 - 2 \times 30 = 120^{0}$

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