When one light ray is reflected from a plane mirror with 30 ° angle...

When one light ray is reflected from a plane mirror with

30 °

angle of reflection, the angle of deviation of the ray after reflection is: When one light ray is reflected from a plane mirror with 30 ° angle of reflection, the angle of deviation of the ray

When one light ray is reflected from a plane mirror with 30 ° angle of reflection, the angle of deviation of the ray

Options

A $120 °$
B $110 °$
C $140 °$
D $130 °$

Correct answer

A. $120 °$

Step-by-step solution

It is given that $i = 30 °$ .

When one light ray is reflected from a plane mirror with 30 ° angle of reflection, the angle of deviation of the ray

The formula for angle of deviation is
$\delta = 180 ° - 2i$

Substituting the values,
$\delta = 180 ° - 60 °$
$= 120 °$

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