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A luminous object and a screen are at a ...

A luminous object and a screen are at a fixed distance D apart. A converging lens of focal length f is placed between the object and screen. A real image of the object in formed on the screen for two lens positins if they are separated by a distance d equal to

A

`sqrt(D(D+4f))`

B

`sqrt(D(D-4f))`

C

`sqrt(2D(D-4f))`

D

`sqrt(D^(2)+4f)`

Text Solution

Verified by Experts

The correct Answer is:
B
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