Question

An object is placed at 30cm in front of a concave mirror of focal length 15cm . at what distance from the mirror should be a screen be placed

Answer 1

Here frnd....!!

MIRROR FORMLUA:- 1/V + 1/U = 1/F

But for this question the suitable formula is 1/v = 1/f - 1/u.
[ to find image ]

SO, The F (focal length) is 15.
The u (distance of the object is 30.