Question

An object is placed 30 cm away from a convex lens of focal length 20 cm find the
nature and size of Image formed,​

Answer 1

Answer:

An object is placed at a distance of 30 cm from a convex lens of focal length 20 cm. Image distance, v = ? v=60010=60 cm

Explanation:

hope it's helpful

Answer 2

Answer:

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,

201 − −301 = f1

∴f=12cm

∴ Focal length of convex lens=f=12cm