Question

A 3 cm tall object is placed 18 cm in front of a
concave mirror of focal length 12 cm. At what
distance from the mirror should a screen be placed
to see a sharp image of the object on the screen.
Also calculate the height of the image formed.​

Answer 1

Answer:

h=3cm

F= -12cm

u= -18cm

1/f=1/u+1/v

1/v=1/f–1/u

=1/-12-1/-18

v = –36cm

h'/h = –v/u

h'/3 = 36/-12

h'=36*3/-12

h'=-9cm