Q64 / 90 · JEE Main 2023 (11 Apr Shift 2) · Physics

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:

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

Solution

It is given that $i = 30 °$ .

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

Substituting the values,
$δ = 180 ° - 60 °$
$= 120 °$

Hence, the correct answer is option: 'A'.

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