Question

If the angle between the incident ray and normal is 35° , then find the angle between the incident ray and boundary dividing the two medium​

Answer 1

The question clearly states the angle made by the light ray with mirror is 40°. This is NOT angle of incidence. Angle of incidence is the angle made by light ray with the vertical line drawn from the point where it lands on the mirror. This is 90 - 40 = 50°.

Now:

Angle of incidence = Angle of reflection = 50°

So, light bends by 50 + 50 = 100°

:-)

Answer 2

Answer:

Hence the angle between incident ray and reflected ray is equal to 75° + 75° = 150°