HC Verma Chapter 18 Problem 27 – Concave mirror – object between f and c

Given

u=-15 cm, f=-10 cm

Find

Image v

Formula

1/v = 1/f – 1/u

Solution

1/v = 1/(-10) – 1/(-15) = -1/30; v = -30 cm (real, magnified)

Answer

v = -30 cm (real, beyond c, enlarged)

Diagram / Concept

Object between f and 2f gives enlarged real image beyond 2f

Notes

m = -(-30)/(-15) = -2 (inverted, 2x magnified)