A person needs a lens of power +2 dioptres for correcting his near vision. What is the focal length of the lens required to correct the defect?

5 m

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2 m

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50 cm

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20 cm

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Solution

The correct option is C 50 cm
Power = $\frac{1}{f o c a l l e n g t h}$
Focal length = $\frac{100}{2} c m$
= $50 c m$

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