# Determine the angle of incidence of a ray of light, if the reflected ray is at an angle of 90° to the incident ray?

According to the law of reflection

The angle of incidence = Angle of reflection

Let’s draw the figure -

According to question reflected ray is making an angle of 900 with the incident ray.

So angle of incidence + angle of reflected = 900

Since both angle of incidence is equal to angle of reflected

Angle of incidence + angle of incidence = 900

Angle of incidence = 450

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