Question

A cat is looking into a concave mirror that is 12.0cm from her nose. I see her focused real image 16.8cm from the mirror. Determine the focal length and radius of curvature of the mirror.

Answer 1

1/di + 1 /do = 1/ f

di = 16.8 cm

d0= 12 cm

1/ 16.8 + 1 /12 = 1/f

f = 7 cm

focal lenght = 7 cm

r = 2f = 2* 7 = 14 cm

Answers:

Focal lenght= 7cm

Radius = 14 cm