Question

What type of image is formed on a cinema screen?

Answer 1

Hint: Recall that a mirror is a surface that reflects the light rays and bounces them back. Concave mirror is a type of spherical mirror. Concave mirror is a part of a hollow sphere that has its reflecting surface curved in an inward direction. A concave mirror can form both real and virtual images depending on the position of the object.

Complete answer:
When the light rays from a source of light strike the surface of a concave mirror then it converges the light rays to a single point. Since the image formed on the cinema screen is always formed due to the actual meeting of rays, so a concave mirror is used on a cinema screen. Also it is always possible to see a real image on the cinema screen. This type of mirror forms a real image of the object.

Note: It is important to remember that a concave mirror is also known as a converging mirror. A concave mirror follows laws of reflection while undergoing the phenomenon of reflection. This means that the angle of incidence at which a ray strikes the surface of the mirror will always be equal to the angle of reflection at which it is reflected. The incident ray and the reflected ray are separated by a perpendicular line called ‘normal’. Also as per the law of reflection, the incident ray, the reflected ray and the normal all lie in the same plane. These laws of reflection are followed at every point on the surface of the mirror.