Physics
The reflector of a search light is a :

Plane mirror
Convex mirror
Concave mirror
Cylindrical mirror

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

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

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