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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. | |