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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. | |