Question

The focal length of a lens for an object placed 12cm from the lens producing real and inverted image at a distance of 24 cm is​

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

Explanation:

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