Physics
Water drops cannot stick to the oily surface due to

Water is lighter than oil
Cannot mix each other
Lack of adhesive force
Surface tension

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.

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Physics
Energy in reflected light :

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

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