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

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

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

the full weight of the barrel comes into play when it is pulled
the rolling friction is much less than the sliding friction
coal tar is a liquid and it flows in the barrel when it is rolled
more surface area of the barrel is in contact with the road when it is pulled

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