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A small insect viewed through a convex lens is 1.2 cm from the lens and appear twice its actual
size. What is the focal length of the lens?
Solution
m = hi/ho = -di /do
2 = - di / do
and object distance is given , do = 1.2 cm
di = - 2 x 1.2 = - 2.4 cm
Applying lens equation,
1/f = 1/di + 1/do
1/f = 1/(-2.4) + 1/1.2
f = 2.4 cm ......Ans

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