Question

what is the angle of incidence of a ray of the reflected ray is at an angle of 90 to the incident ray​

Answer 1

HELLO....

According to the law of reflection, the angle of incidence is equal to the angle of refraction.

That is, ∠i=∠r. Let it be x.

In this case, the difference between the angle of incidence and angle of refraction is 90 degrees.

Given, ∠i+∠r = 90 degrees

or, x+x=90

2x = 90

x = 90/2

x=45

Hence, the angle of incidence is 45

hope helps....

Answer 2

If the reflected ray is at the angle of 90o to the incident ray, then the angle of incidence is 45o. According to the law of reflection, the angle of incidence and the angle of reflection are equal. Therefore, the angle of incidence and the angle of reflection both are 90/2=45o.