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Question

# Assertion :Two convex lenses of same material and equal focal length ′f ′ from achromatic combination when separated by distance ′f ′. Reason: 1F=1f1+1f2−df1f2 where F= equivalent focal length of lenses having focal lengths f1 and f2 separated by a distance ′d ′

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionFor achromatic combination of two convex lenses of same material separated by distance x such that,ωf1+ωf2=2xωf1f2Hence the Reason is not the correct explanation for Assertion.

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