If refractive index of red, violet and yellow lights are 1.42, \( 1.62 \) and \( 1.50 \) respect...

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If refractive index of red, violet and yellow lights are 1.42, \( 1.62 \) and \( 1.50 \) respectively for a medium. Its dispersive power will be
(A) \( 0.4 \)
(B) \( 0.2 \)
(C) \( 0.3 \)
(D) \( 0.1 \)
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