Question

Definition of angle of reflection

Answer 1

Answer:

The angle between the direction of motion of the oncoming wave and a perpendicular to the reflecting surface (angle of incidence) is equal to the angle between the direction of motion of the reflected wave and a perpendicular (angle of reflection). Reflection at rough, or irregular, boundaries is different

Answer 2

• The angle formed between the reflected ray (OQ) and the normal (ON) on the reflecting surface (mirror) is termed as angle of reflection. It is denoted by 'r'.

Have a look at the image attached above and consider an object at the point P.

The ray PO from object, travelling towards the mirror is called incident ray. The point O at which the incident ray meets the mirror is called point of incidence. The ray OQ, which bounces off the surface of the mirror when the incident ray strikes the mirror is called reflected ray. The perpendicular ON drawn to the surface of the mirror at the point of incidence is called normal ray. The angle formed between the incident ray PO and the normal ON is called angle of incidence. It is denoted by 'i'. The angle formed between the incident ray PO and the reflecting surface is called glancing angle of incidence. It is denoted by 'gᵢ'. The angle formed between the reflecting surface and the reflected ray OQ is called glancing angle of reflection. It is denoted by 'gᵣ'. $\:$

LAWS OF REFLECTION:

1. The incident ray, the reflected ray and the normal, all lie in the same plane.
2. The angle of incidence is equal to the angle of reflection, i.e., ∠i = ∠r.