HC Verma Chapter 18 Problem 13 – Magnification by convex lens

Given

Object u=-30 cm, f=10 cm

Find

Magnification m

Formula

Find v then m = v/u

Solution

1/v = 1/10 + 1/(-30) = 2/30; v = 15 cm; m = 15/(-30) = -0.5

Answer

m = -0.5 (inverted, half size)

Diagram / Concept

Negative m means inverted image

Notes

Object between f and 2f gives inverted real image