Physics
Siphon will fail to work if:

The level of the liquid in the two vessels are at the same height.
The temperature of the liquids in the two vessels are the same.
Both its limbs are of unequal length.
The densities of the liquid in the two vessels are equal.

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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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