HC Verma Chapter 18 Problem 28 – Object at center of curvature of concave mirror

Given

u = -2f = -20 cm, f=-10 cm

Find

Image v

Formula

1/v = 1/f – 1/u

Solution

1/v = 1/(-10) – 1/(-20) = -1/20; v = -20 cm

Answer

v = -20 cm (coincides with object, m=-1)

Diagram / Concept

Image at C: real, inverted, same size

Notes

Experimental method to locate center of curvature of concave mirror