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Multiple Choice Question with Two or More Choices Correct
A lens is placed in air. The focal length of the lens depends upon
(a) the object and image distances
(b) the refractive index of the material of the lens
(c) the radii of curvature of its faces
(d) the wavelength of light used

Chemistry

Multiple Choice Question
Which of the following substances does not crystallize in the rock-salt structure?

(a)

NaCl

(b)

KCl

(c)

MgO

(d)

CsCl

Mathematics

Three numbers are chosen at random without replacement from {1, 2, ..., 10}. The probability that the minimum of the chosen numbers is 3, or their maximum is 7, is ......... .

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