A) 1 convex lens and 1 plane mirror
B) 1 convex, 1 concave lens
C) 2 convex lenses
D) 2 concave lenses
Correct Answer: B
Solution :
If two or more lenses are combined together in such a manner that this combination provides a image of different colours at the same point and of the same size. Then this property is known as achromatism for this concave and convex are used.
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