Question

What is the angle of incidence of a ray if the reflected ray is at

angle of 900 to the incident ray​

Answer 1

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

o.r, x+x=90 °

or, x=45 °

Hence, the angle of incidence is 45 °

Answer 2

• As ray of incidence makes a angle of 90 degree with the reflected ray ,angle of incidence=90/2 =45 degree