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An achromatic combination of lenses is formed by joining

1. 2 convex lenses
2. 2 concave lenses
3. 1 convex and 1 concave lens
4. 1 convex and 1 plane mirror

Correct answer: 1 convex and 1 concave lens

Solution

An achromatic combination is formed by joining a convex lens and a concave lens to correct chromatic aberration by balancing their dispersive powers.

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