An equiconvex lens of refractive index n_2 is placed such that the refractive index of the surrou...

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An equiconvex lens of refractive index n_2 is placed such that the refractive index of the surrounding media is as shown. Then the lens:
(A) must be diverging if n_2 is less than the arithmetic mean of n_1 and n_3
(B) must be converging if n_2 is greater than the arithmetic mean of n_1 and n_3
(C) may be diverging if n_2 is less than the arithmetic mean of n_1 and n_3
(D) will neither be diverging nor converging if n_2 is equal to arithmetic mean of n_1 and n_3

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