First slide

Dispersion

Question

An achromatic combination of lenses is formed by joining

Moderate

A

2 convex lenses
B

2 concave lenses
C

1 convex lens and 1 concave lens
D

Convex lens and plane mirror

Solution

$For an achromatic combination \frac{ω_{1}}{f_{1}} + \frac{ω_{2}}{f_{2}} = 0 i.e. 1 convex lens and 1 concave lens.$

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