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

Answer:

4.2591 cm

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 $\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$

So $\frac{1}{6.91}=\frac{1}{v}-\frac{1}{11.1}$

$0.1447=\frac{1}{v}-0.09$

$\frac{1}{v}=0.2347$

$v=4.2591cm$