We know that plane mirror reflects light.

The reflected ray from one mirror can act as the incident ray on another mirror.

Hence, the ray of light can be reflected again.

Hence, a reflected light can be reflected again.

 

Just like in this image,

Multiple Images formed by 2 mirrors side to side - Teachoo.jpg

Example 1 - Periscope

Submarine with a periscope - Teachoo.jpg

A periscope is a long, tubular device through which a person can see objects that are not in direct line of sight.

It is a device which is used

  • to see over the heads of a crowd
  • by soldiers sitting in a trench to observe enemy activities outside
  • it is used by submarines to see ships over the surface of water in the sea.



In a periscope,



Two mirrors are placed parallel to each other

Image of one mirror is reflected to other mirror and we able to see image

Periscope-Teachoo.png

Example 2 - Barber Shop Mirrors

Barber Shop Mirrors - Teachoo.jpg

We are able to see the back of the head with the help of 2 mirrors

The light is reflected from our hair on the small mirror.

This light is automatically reflected to main mirror

So we are able to see the back of out head

 

Multiple Reflection when 2 mirrors are placed side by side

If 2 mirrors are placed close to each other,it produces Multiple reflections

Multiple Images formed by 2 mirrors side to side - Teachoo.jpg

 

The number of Images formed depends on the angle between two images

It is given by a simple formula

Formula to Find Number of Images (When two mirrors are placed side by side).png

Let’s also see the Formula working in reality

Multiple Images formed by Mirrors - with Examples - Teachoo.jpg

  1. Class 8
  2. Chapter 16 Class 8 - Light

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.