A1.50 cm high diamond ring is placed 20.0 cm from a concave mirror with radius of curvature 30.00 cm. the magnification is

Magnification, m = -0.42

Explanation:

It is given that,

Height of diamond ring, h = 1.5 cm

Object distance, u = -20 cm

Radius of curvature of concave mirror, R = 30 cm

Focal length of mirror, f = R/2 = -15 cm (focal length is negative for concave mirror)

Using mirror's formula :

, f = focal length of the mirror

v = -8.57 cm

The magnification of a mirror is given by,

m = -0.42

So, the magnification of the concave mirror is 0.42. Thew negative sign shows that the image is inverted.