Question

If a ray of light is incident on a plane mirror such that it makes an angle of 30with the mirror, then will be the angle of reflection?

Answer 1

Ray of light strikes the mirror at an angle of 30°. 

⇒ It will make an angle of 60° (90° – 30°) with the normal. As shown in the figure below. 

∴ Angle of incidence = 60°. 

Now, By laws of reflection; 

Angle of Incidence = Angle of reflection; 

⇒ Angle of reflection = 60°. 

Hence Angle of reflection is 60°.