First slide

The lens

Question

A combination of two thin lenses of the same material with focal lengths f₁ and f₂, arranged on a common axis minimizes chromatic aberration, if the distance between them is

Moderate

A

$\frac{(f_{1} + f_{2})}{4}$
B

$\frac{(f_{1} + f_{2})}{2}$
C

$(f_{1} + f_{2})$
D

$2 (f_{1} + f_{2})$

Solution

$d = \frac{(f_{1} + f_{2})}{2}$

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