Explain the nature of the image formed by plane mirror.

Image formed by a plane mirror is always virtual and erect.

Some of the characteristics of images formed by plane mirror are given below:

  • The image formed is upright.
  • Size of object is equal to size of image.
  • Laterally inverted image (image of left side visible on right side).
  • The image formed is as far behind the mirror as the object is in front of it.
  • The focus of a plane mirror is at infinity.

Uses of Plane mirror

  • They are used in constructing periscope which is used in submarines.
  • They are used to make various scientific instruments.


Image formed by a convex mirror is always virtual and smaller in size.

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