Question

a) Define mirror and explain the plane mirror?​

Answer 1

Answer:

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A mirror is a smooth surface on which regular reflection takes place. ... Concave mirror: If the concave surface of a sphere acts as the reflector, that is if regular reflection of light takes place from the concave surface of the spherical mirror, then it is called a concave mirror.

Explanation:

Diagram and explanation both are here

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Answer 2

MIRROR:

A mirror is a reflective surface that bounces off light, thus producing a real or virtual image.

PLANE MIRROR:

A plane mirror is a mirror with a flat reflective surface.For light rays striking a plane mirror, the angle of reflection equals the angle of incidence. The angle of the incidence is the angle between the incident ray and the surface normal. Therefore, the angle of reflection is the angle between the reflected ray and the normal and a collimated beam of light does not spread out after reflection from a plane mirror, except for diffraction effects.

A plane mirror makes an image of objects in front of the mirror; these images appear to be behind the plane in which the mirror lies. A straight line drawn from part of an object to the corresponding part of its image makes a right angle with, and is bisected by, the surface of the plane mirror. The image formed by a plane mirror is always virtual, upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come. However, the image is a laterally-inverted "mirror image" of the object. If a person is reflected in a plane mirror, the image of his right hand appears to be the left hand of the image.

Plane mirrors are the only type of mirror for which a real object always produces an image that is virtual, erect and of the same size as the object. Virtual objects produce real images, however.The focal length of a plane mirror is infinity; its optical power is zero.