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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