Assertion : When two lenses are used to make achromatic lens combination then the materials of the two lenses are always different. Reason : Dispersive power of the materials of the two lenses must be of opposite sign to become achromatic combination.

Assertion : When two lenses are used to make achromatic lens combinati

1.	Assertion : When two lenses are used to make achromatic lens combination then the materials of the two lenses are always different. Reason : Dispersive power of the materials of the two lenses must be of opposite sign to become achromatic combination.
Answer» If both assertion and REASON are correct and RASON is a correct EXPLANATION of the assertion. If both assertion and reason are correct but reason is not the correct explanation of assertion. If assertion is correct but reason is INCORRECT. If assertion is incorrect but reason is correct. Answer :C

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Assertion : When two lenses are used to make achromatic lens combination then the materials of the two lenses are always different. Reason : Dispersive power of the materials of the two lenses must be of opposite sign to become achromatic combination.

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