Pick out the formula for dispersive power from the following. – McqOptions

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1.	Pick out the formula for dispersive power from the following.
A.	Dispersive power = \(\frac {mean \, deviation}{angular \, dispersion }\)
B.	Dispersive power = mean deviation * angular dispersion
C.	Dispersive power = mean deviation + angular deviation
D.	Dispersive power = \(\frac {angular \, dispersion}{mean \, deviation}\)
Answer» E.

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