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A thin convex lens of focal length $10 \mathrm{~cm}$ is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be
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The correct answer is:
Infinity
$f=\frac{f_1 f_2}{f_1+f_2}=\frac{10(-10)}{10+(-10)}=\frac{-100}{10-10}={ }_{\infty}$
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