Question

An object is placed at a distance of 50cm from a concave lens. The image is formed at a distance of 20cm from the lens. Find the focal length of the lens. ​

Answer 1

Answer:

The answer is in the above attached picture....

hope it helps you

Answer 2

PLZ HELP ITZ URGENT:-

$( \frac{x}{a} + 1) \div - \frac{1}{a}$