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Q.

A convex lens has 9 cm focal length and a concave lens has – 18 cm focal length. The focal length of the combination in contact will be

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a

18 cm

b

9 cm

c

-18 cm

d

-9 cm

answer is D.

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Detailed Solution

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$\frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}} \Rightarrow \frac{1}{F} = \frac{1}{(+ 18)} \Rightarrow F = 18 cm$

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