Question

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

Answer 1

Answer:

Hey Mate ...

the answer of your question is....

..

$\frac{1}{v} + \frac{1}{u} = \frac{1}{f} \\ \frac{1}{20} + \frac{1}{ - 50} = \frac{1}{f} \\ = \frac{ - 50 + 20}{ - 100} \\ = \frac{ - 30}{ - 100} \\ = \frac{3}{10} \\ = \red{0.3 \: cm}$

hope it helps you...

....... THANKYOU. .... ...

Answer 2

Answer:

Sale phir se panga mat lena