Question

If the sum of angle of incidence
angle of reflection be 130 find
the angle of reflection and angle
formed between the reflected ray with
the surface of the reflector.​

Answer 1

Angle of incidence: i

Angle of reflection: r

As i = r,

let i = r = x

i + r = 130°

∴ x + x = 130°

2x = 130°

x = 65°

As the surface of the reflector, and all the rays lie on the same plane and line, all angles form a linear pair.

∴ 130° + Glancing angle + angle to be found = 180°

As Glancing angle = angle to be found,

130° + y + y = 180°

y = 25°