Question

A convex mirror has a focal length of 20 cm.
Determine an object location for which the image
will be one-half the size of the object.​

Answer 1

Answer:

f=20cm

size of image =1/2 size of object ______1

v/u=size of image /size of object

v/u = 1/2size of object/size of object {from 1)

v/u= 1/2

v=u/2_________2.

1/f=1/v-1/u

1/20=2/u-1/u (from2)

1/20=1/u

u =20cm

An object location is 20cm