Concepts Of Physics MCQ Edition [Volume 1]PhysicsDispersion and Spectra

A specific material exhibits refractive indices of 1.56 , 1.60 , and 1.68 for red, yellow, and violet light, respectively. Determine the dispersive power of the material.

Options

A0.24
B0.20
C0.12
D0.18

Correct answer

B. 0.20

Step-by-step solution

The dispersive power of a material is given by the formula: = _v - _r _y - 1 Given the refractive indices for violet, red, and yellow light: _v = 1.68 _r = 1.56 _y = 1.60 Substituting the values into the formula: = 1.68 - 1.56 1.60 - 1 = 0.12 0.60 = 0.20

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