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Two lens of focal lengths –20cm and +10cm are put in combination, find the power of the combination

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+5D

–2D

–1D

+2D

answer is C.

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Detailed Solution

$\begin{array}{l} \frac{1}{F} = \frac{1}{f_{1}} + \frac{1}{f_{2}}; \frac{1}{F} = \frac{1}{- 20} + \frac{1}{10}; F = 20 cm \\ P = \frac{100}{F} = \frac{100}{20} = + 5 D \end{array}$

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