Physics
A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :

(3/4)f
(7/3)f
(4/3)f
F

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Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of neutrons but different number of protons
the same number of protons but different number of neutrons
equal number of nucleons

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