Separation between on object and screen is 100 cm using a convex lens, a sharp image is to be formed on the screen. What can be the maximum possible focal length of the lens?
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a
15 cm
b
20 cm
c
25 cm
d
30 cm
answer is C.
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Detailed Solution
For formation of sharp image on the screen, D≥4f⇒f≤D4∴ fmax=D4=1004cm=25 cm