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

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures

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