A ray of light is incident on a plane mirror at an angle of 20° to the horizontal what is the angle of reflection??
To determine the angle of reflection, we can make use of the law of reflection, which states that the angle of incidence is equal to the angle of reflection.
In this case, the given angle of incidence is 20° to the horizontal. Since a plane mirror reflects light symmetrically, the angle formed between the incident ray and the normal to the mirror is also 20°.
The normal is an imaginary line drawn perpendicular to the surface of the mirror at the point of incidence. To find the angle of reflection, we need to consider the angle between the reflected ray and the normal.
Since the incident and the reflected ray are on opposite sides of the normal, the angle of reflection is also 20°.
So, the angle of reflection is 20°.