Angle as rotation of a ray.

Angle OF rotation

Complete angle if a rotating ray after making a complete revolution coincide with the initial position the angle formed is called a complete angle.

a ray of light is incident on a plane miror at an angle of 30^(@) in anti-clockwise direction. Find the angle and sense of rotation of the reflected ray.

A ray of light is incident on the surface of plate of glass of refractive index 1.5 at the polarising angle. The angle of refraction of the ray will be

What is the angle of incidence of a ray if the reflected ray is at an angle of 90^(@) to the incident ray?

What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light? Draw a labelled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light.

Figure shows a mirror M on which a light ray incident at an angle 40^(@) from normal. If the ray is rotated by 10^(@) clockwise find the change in angle of deviation of light after reflection.