Question

Priya focused the image of candle flame on a white screen using a convex lens. She noted down the position of the candle, screen and lens as under : position of candle =10cm,
position of convex lens =34cm, position of screen =58 cm

Answer 1

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Answer 2

Answer:

Focal length of the convex lens is 12 cm

Explanation:

Position of screen = 10 cm

position of convex lens = 34 cm

position of screen = 58 cm

distance between object and the lens, u = - (34 - 10) = - 24 cm

distance between the image and the lens, v = (58 - 34) = 24 cm

Let f is the focal length of the lens.

Use lens equation

$\frac{1}{f}=\frac{1}{v}-\frac{1}{u}$

$\frac{1}{f}=\frac{1}{24}+\frac{1}{24}$

f = 12 cm

Thus, the focal length of the convex lens is 12 cm.

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