Question

A concave mirror of radius of curvature 40 cm is to be used to obtain a real image of an object. The image is to be one- third as large as the object. Where should the object be placed, and where is the image to be found?​

Answer 1

u = 80 cm and v = 80/3 cm

Step-by-step explanation:

focal length f = +40/2 = 20 cm.

magnification m = v/u = 1/3, thus v = u/3

using 1/u+1/v=1/f gives 1/u=1/(u/3)=20

So u = 80 cm and v = 80/3 cm