First slide

Dispersion

Question

Two lenses having $f_{1} : f_{2} = 2 : 3$ has combination to make no dispersion. Find the ratio of dispersive power of glasses used

Moderate

A

2 : 3
B

3 : 2
C

4 : 9
D

9 : 4

Solution

$\frac{ω_{1}}{ω_{2}} = - \frac{f_{1}}{f_{2}} = - \frac{2}{3}$

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