A photographic camera with a lens of 5.6 cm is used for capturing images. Vertical length of film used is 24 mm in which image of a 1.68 m tall man is to be captured. Find minimum distance (in m) of the man from lens such that his complete image can be obtained. (Approx answer to the nearest integer).
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Ans. 4
Sol. m = 
= 
= 
(lens is convex and image is inverted)
m = 
Let u = – x so v = 
with f = 5.6 cm solving x = 3.96 m ~ 4.0 m
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