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A converging lens of focal power 6D is combined with a diverging lens of focal power -2D. The focal length of the combination is

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+ 25 cm

– 25 cm

+ 50 cm

– 50 cm

answer is C.

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Detailed Solution

$\begin{array}{l} P = P_{1} + P_{2} = 6 . - 2 = 4 D \\ ∴ f = \frac{1}{P} in metre; \frac{1}{4} = 0.25 m = 25 cm \end{array}$

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