Question

If angle between two plane mirrors is 120 degrees then how many images were formed

Answer 1

Answer:3

Step-by-step explanation:

The number of images formed by a pair mirrors kept at an angle
`\alpha` is

`n=(360)/(\alpha ) -1` if
`(360)/(\alpha )` comes even.

`n=(360)/(\alpha )` if
`(360)/(\alpha )` comes odd.

where
`n` is the number of images formed.

In our question,

`\alpha =120^(0)`

`(360)/(\alpha ) =(360)/(120)=3`

It is odd,so
`n=(360)/(120)=3`