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

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

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Physics
A balloon filled with hydrogen will

Reach a particular height and start coming down
Burst after reaching some height
Reach a particular height and remain floating
Continue going upwards uninterrupted

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