Physics
Which one of the following is the correct sequence of passage of light in a compound microscope?

Condenser -Objective lens -Body tube -Eyepiece
Objective lens -Condenser -Body tube -Eye piece
Eyepiece -Objective lens -Body tube -Mirror
Condenser -Objective lens -Eye -piece -Body tube

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Physics
What is a compound microscope?

A microscope whose lenses are convex.
A microscope whose lenses are concave.
A microscope that has one lens.
A microscope that has two sets of lenses : an occular lens and an eyepiece.

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a lower density than metals
Metals have higher thermal capacity than plastics
Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat

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