Question

A concave lens of focal length 15cm forms an image 10cm from the lens. how far is the object from the lens​

Answer 1

Answer:

f = - 15 cm

v = -10 cm

1/v - 1/u = 1/f

1/v - 1/f = 1/u

1/u = 1/-10 - 1/-15

= 1/-10 + 1/15

= -3 + 2/30

= -1/ 30

u = -30 cm

I hope this answer will help you mate!