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The image of a small electric bulb fixed...

The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall `3 m` away by means of a large convex lens. What is the maximum possible focal length of the lens required for the purpose ?

A

3.25 m

B

1.55 m

C

0.75 m

D

0.28 cm

Text Solution

Verified by Experts

The correct Answer is:
C
For a real image on screen formed by curve lens, the minimum distance between object plane and screen, should be four times the focal lens.
`4f_(max) = 3 rArr f_(max) = (3)/(4) = 0.75` m.
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