A convex lens forms inverted image of a real object on a fixed screen. The size of image is 9 cm. When lens is displaced 40 cm along principle axis it again forms a real image of size 4 cm on the screen. Focal length of the lens is.
Text Solution
Verified by ExpertsThe correct answer is:
A
Since m 1 m 2 = 1 
h 0 = 
= 6cm
for first position of the lens
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