Question

4. Draw the ray diagrams for the following condition for conver ens having focal length = 30cm? a) object place at 30 cm b) object place at 60 cm​

Answer 1

Answer:

fied by Toppr

Here,

Image distance=v=20cm,

Object distance=u=−30cm,

Lens equation is given by,

v

1

−

u

1

=

f

1

,

putting the values we get,

20

1

−

−30

1

=

f

1

,

∴f=12cm

∴ Focal length of convex lens=f=12cm

solution