Question

Question #fa5ff

Answer 1

His image is formed `2 \ "cm"` from the mirror and his mouth is also `5 \ "cm"` wide.

Explanation:

In a plane mirror image, the image will be the same distance as you are from the mirror, with the same shape and size.

So, the boy with a `5 \ "cm"` wide mouth will also have a mouth that's `5 \ "cm"` wide in the mirror, and his image will also be `2 \ "cm"` away from the mirror.

Answer 2

Using mirror formula,

`1/v + 1/u =1/f`

For a plane mirror `f = prop`

So, `v=-u`

that means, image will be formed `2cm` away from the mirror,i.e `(2+2)=4 cm` away from the boy

There will be no change in the width of the mouth,as image formed by plane mirror only cause lateral rotation of an image,i.e the sides of the image gets changed only,so mouth being a bilaterally symmetrical structure,no such change will be appreciable.