Question

in concave lens f is equal to 30 at what distance the image formed at 20 cm find distance of object placed and also magnification.​

Answer 1

Answer: u= 12cm

Magnification = 1.6

Explanation:

1/v - 1/u =1/f

Solve for u

U=12cm

Magnification = v/u

=20/12

=5/3 or 1.6