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The lens in an overhead projector forms ...

The lens in an overhead projector forms an image `P^(')` of a point P on an overhead tranparency, If the screen is moved closer to the projector to keep the image on the screen in focus, the lens must be

A

moved up

B

moved towards left

C

moved down

D

moved towards right

Text Solution

Verified by Experts

The correct Answer is:
a.
If screen is moved closer, effective image distance decrease. Now to satisfy `(1)/(v)+(1)/(u)=(1)/(f)` , object distance should be increased. For this lens should be moved up.
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