Question

A ray deviates 90 after suffering reflection from a mirror. The angle of incidence is

(a) 90 (b) 30

(c) 45 (d) 60

Answer 1

A ray deviates 90 after suffering reflection from a mirror. Theangle of incidence is. (a) 90

Answer 2

The angle of incidence is 45 degrees.

Explanation:

The angle of deviation of the mirror is 90.

Using the relation,

Deviation angle, $\delta =\pi -(i+r)$

i and r are angle of incidence and angle of reflection respectively

According to the law of reflection, angle of incidence = angle of reflection

$90 =\pi -2i\\\\i=45^{\circ}$

So, the angle of incidence is 45 degrees.

Learn more,

Laws of reflection

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