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Q.

Choose the formula for dispersive power from the list below.

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a

Dispersive power = mean deviation + angular deviation

b

Dispersive power = mean deviation * angular dispersion

c

Dispersive power  =  angular dispersion /mean deviation

d

Dispersive power  = mean deviation / angular dispersion

answer is D.

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Detailed Solution

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The dispersive power formula is as follows:

Dispersive power ω=Angular dispersion(δV-δR)Mean deviation(δ)

ω=μV-μRμ-1

Where μ=μV+μR2= mean refractive index


 

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