Q.

An achromatic combination of lenses is formed by joining

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a

2 convex lenses

b

2 concave lenses

c

1 convex lens and 1 concave lens

d

Convex lens and plane mirror

answer is C.

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Detailed Solution

For an achromatic combination ω1f1+ω2f2=0  i.e. 1 convex lens and 1 concave lens.
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