A) 2 convex lenses
B) 2 concave lenses
C) 1 convex lens and 1 concave lens
D) Convex lens and plane mirror
Correct Answer: C
Solution :
For an achromatic combination \[\frac{{{\omega }_{1}}}{{{f}_{1}}}+\frac{{{\omega }_{2}}}{{{f}_{2}}}=0\] i.e. 1 convex lens and 1 concave lens.
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