Physics
For a ray of light to suffer total internal reflection it has to pass from :

Air to glass
Air to water
Glass to water
Water to glass

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

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