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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