Question

An concave lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object placed from the lens. Draw ray diagram for this situation.​

Answer 1

Explanation:

f=15

v=10

1/v+1/u=1/f

1/u=1/f -1/v

=1/15-1/10

=10-15/150

= -5/150

Please do the further calculation yourself I gotta go sorry dear friend