Physics
The rotational effect of a force on a body about an axis of rotation is described in terms of

Centre of gravity
Centrifugal force
Centripetal force
Moment of force

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Physics
What is refractive index ?

None of above
It is defined as the ratio of speed of light in the medium to the speed of light in vacuum.
It is defined as the ratio of speed of light in vacuum to the speed of light in the medium.
It is defined as the product of speed of light in medium and in vacuum.

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

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

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