A ray of light strikes a plane mirror at an angle of 40∘ to the mirror surface. What will be the angle of reflection ?
Step 1, Given data and image
Angle made by the ray of light with the surface of the mirror = 40∘
We can draw
Step 2, Finding the angle of reflection
Angle made with the mirror surface = 40°
From the figure
Angle of incidence = 90° - 40° = 50°
From the laws of reflection,
angle of reflection = angle of incidence = 50°.
Hence the angle of reflection is 50°.