Question

take two plan mirrors.Find the the number of image formed of a candle kept between the mirrors,when the reflecting surfaces are kept facing each other inclining each other at 1)90°C 60°. draw diagram​

Answer 1

The number of images formed when two mirrors are placed at an angle theta to each other is given by:

n = ( 360 / theta ) - 1

So, here, we have the mirrors placed perpendicular to each other. So, theta = 90 degree

=> n = no. of images formed

=> n = ( 360 / 90 ) - 1

=> n = 4 - 1

=> n = 3

So, a total of three images will be formed.

Even if you try it practically, one of the images will be formed at the junction of the two mirrors. This video might help:

You can also try for different angles.

Similarly, when the 2 mirrors are placed parallel to each other, theta = 0 degree

So, number of images formed = infinite

Also, when the two mirrors are placed side by side, theta = 180 degree

=> n = ( 360 / 180 ) - 1

=> n= 2 - 1

=> n = 1

And hence, only one image is formed as a whole.