Question

The angle of incidence of a ray is 18⁰. What is the measure of the angle between the reflected ray and the surface?

Answer 1

Answer:

angle of incidence=angle of reflection

Answer 2

Answer:

ANGLE OF INCIDENCE TO NORMAL: 18 degree

Thus, angle of reflected ray to normal: 18 degree

BUT ANGLE OF NORMAL TO THE SURFACE= 90 degree

So angle of reflected ray to the surface= 90-18= 72 degree