Physics
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :

(3/4)f
(7/3)f
F
(4/3)f

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Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It rotates at the same speed as the earth around the sun
It is smaller than the earth

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