Assertion :Focal length of a combination of same type of lenses in contact is always less than focal length of any of the lenses. Reason: The focal length f of a combination of lenses of focal lengths f1 and f2 in contact is given by $\frac{1}{F} = \frac{1}{F_{1}} + \frac{1}{F_{2}}$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Yes focal length of a combination of same type of lenses in contract is always less than focal length of any of the lenses assertion is correct and reason is also correct focal lengths $f_{1}$ and $f_{2}$ in contact is given by $\frac{1}{f} = \frac{1}{f_{1}} + \frac{1}{f_{2}}$
so reason is correct.
Hence, the answer is Both assertion and reason are correct and reason is the correct explanation for assertion.

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Assertion :Focal length of a combination of same type of lenses in contact is always less than focal length of any of the lenses. Reason: The focal length f of a combination of lenses of focal lengths f1f1 and f2f2 in contact is given by1F=1F1+1F21f=

Assertion :Focal length of a combination of same type of lenses in contact is always less than focal length of any of the lenses. Reason: The focal length f of a combination of lenses of focal lengths f1 and f2 in contact is given by $\frac{1}{F} = \frac{1}{F_{1}} + \frac{1}{F_{2}}$