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Q.

White light is passed through a prism of angle 5⁰. If the refractive indices for red and blue colours are 1.641 and 1.659 respectively, calculate the dispersive power

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a

0.028

b

0.56

c

0.28

d

0.056

answer is B.

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Detailed Solution

$ω = \frac{μ_{b} - μ_{r}}{(\frac{μ_{b} + μ_{r}}{2} - 1)}$

$ω = \frac{1.659 - 1.641}{(\frac{1.659 + 1.641}{2} - 1)}$

$ω = \frac{0.018}{0.65}$

$ω = 0.02769$

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