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Uses of Plane Mirrors

  • Used in Solar cooker



  • Used in Scientific instruments


  • Used in cameras


  • Plane mirrors are used in dressing table and as looking mirrors.



Visible light, also known as white light, consists of a collection of component colors. These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet called the spectrum. The separation of visible light into its different colors is known as dispersion.


Test your knowledge

Why emergency vehicles such as ambulances are often marked on the front hood with reversed lettering (Example : ECNALUBMA)?


Most drivers will view the approaching vehicles using their rear-view mirrors. As such, they will be viewing an image of the lettering. Such images undergo lateral inversion and so will appear with the proper orientation – AMBULANCE



If Raman stands 3 feet in front of a plane mirror, how far from the person will his image be located?


Raman (the object) is located 3 feet from the mirror. His image will be located 3 feet behind the mirror. Thus, the distance between Raman and the image will be 6 feet.



If a toddler crawls towards a mirror at a rate of 0.25 m/s, then at what speed will the toddler and the toddler's image approach each other?


In one second, the toddler has moved towards the mirror by a distance of 0.25 meters. In the same second, the image will be 0.25 meters closer as well. Thus, the toddler and its image have become 0.50 meters closer in 1 second.0.50m/s.



Six students are arranged in front of a mirror. Their positions are shown below. The image of each student is also drawn on the diagram. Make the appropriate line of sight constructions to determine whom each individual student can see.


  • Al can see Ed and Fred
  • Bo can see Ed, and Fred
  • Cy can see Cy, Di, Ed, and Fred
  • Di can see Cy, Di, and Ed, 
  • Ed can see Al, Bo, Cy, Di, and Ed
  • Fred can see Bo, Cy, Di, and Ed




Keerthana stands between a set of parallel plane mirrors (M1 and M2) as shown in the diagram below. There is a flower on Keerthana's hat which is located a distance of 0.4 m from M1 and a distance of 1.0 m from M2. Since the mirrors are parallel, Keerthana will see an infinite number of images of the flower as she looks in mirror M2. These images stretch towards infinity. Some of the images are closer to the mirror than others.


Determine the distance between mirror M2 and the...

... nearest image ____________

... second nearest image____________

... the third nearest image


Keerthana will see a primary image 1.0 m to the right of M2. She will see a secondary image 1.8 m to the right of M2; this is the image of the image of the rose. Finally, there is a tertiary image located 3.8 m to the right of M2. It is the image of the image of an image.

1.0 m, 1.8 m, and 3.8 m


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