Question

A concave lens has focal length of 20cm. at what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens?​

Answer 1

u= ?

v = 10 cm

f = - 20 cm ( concave lens)

by using lens formula :-

1/f = 1/ v - 1/u

by putting values you get distance of object is - 20/ 3 cm

I HOPE THIS IS CORRECT

IF YES MARK IT BRAINLIST PLEASE