Question

You have a lens whose focal length is 6.91 cm. You place an object on the axis of the lens at a distance of 11.1 cm from it. How far is the object\'s image from the lens?

Answer 1

4.2591 cm

Step-by-step explanation:

We have given focal length of the lens f=6.91 cm

Object distance u =11.1 cm

We have to find the image distance that is v

For the lens we know that
`(1)/(f)=(1)/(v)-(1)/(u)`

So
`(1)/(6.91)=(1)/(v)-(1)/(11.1)`

`0.1447=(1)/(v)-0.09`

`(1)/(v)=0.2347`

`v=4.2591cm`