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A. If both Assertion \& Reason are True \& the Reason is a correct explanation of the Assertion.
\( \mathrm{P} \)
B. If both Assertion \& Reason are True but Reason is not a
W correct explanation of the Assertion.
C. If Assertion is True but the Reason is False.
D. If both Assertion \& Reason are False.
Assertion : Consider a combination of two thin - lenses in contact. If the combination has to behave . as an achromatic system with a non-zero power, the two lenses then must be of different materials, must have different focal lengths and must be opposite nature.
Reason : Condition for acromatism of two thin lenses in contact is \( \frac{\omega_{1}}{\mathrm{f}_{1}}+\frac{\omega_{2}}{\mathrm{f}_{2}}=0 \); here \( \omega_{1} \) and \( \omega_{2} \) - are dispersive powers of the materials of the lenses and \( f_{1} \) and \( f_{2} \) are their focal lengths respectively.
(1) A
(2) B
(3) \( \mathrm{C} \)
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