Question

A convex lens of focal length 12 cm is
placed at a distance of 16cm from the
screen. The distance should an object
be placed so as to form its real image
on the screen.
a)+48 cm
b)-48 cm
c)+24 cm
d)-9.6 cm
pls do fast pls​​

Answer 1

Answer:

Focal length of convex lens, f=8 cm

Object distance, u=−12 cm

Using lens formula

v

1

−

u

1

=

f

1

where v is the image distance.

∴

v

1

−

−12

1

=

8

1

⟹ v=+24 cm

(+ve sign indicates that image is formed behind the lens)

Hence the image formed is real and inverted.