Physics
Find the power of a convex lens if the image formed is at a distance of 16 cm from the lens when the object is placed on the other side of the lens at 20 cm from the optical centre?

3.75 diopters
-3.75 diopters
11.25 diopters
-11.25 diopters

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat

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Physics
What is a compound microscope?

A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope that has one lens.
A microscope whose lenses are convex.
A microscope whose lenses are concave.

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