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A student focussed the image of a candle...

A student focussed the image of a candle flame on a white screen by placing the flame at various distances from a convex lens. He noted his observations as :

From the above table, find the focal length of lens without using lens formula.

A

f = 15 cm

B

f = 30 cm

C

f = 24 cm

D

f = 60 cm

Text Solution

Verified by Experts

The correct Answer is:
A
This is possible if the object is placed at 2f
`:. 2f = 30 cm , f = 15 cm`
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