Physics
A simple microscope consists of :

A long focus convex lens
A short focus convex lens
A long focus concave lens
A short focus concave lens

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is-deeper than the river

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Physics
Energy in reflected light :

Decreases with the increase in angle of incidence
Increases with the increase in angle
Does not depends on the angle of incidence
Becomes maximum for angle of incidence equal to 45°

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