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NDA NA I 2017 Q106

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1. The radii of curvature of the faces of a double convex lens are 10 cm and 20 cm. The refractive index of the glass is 1.5. What is the power of this lens (in units of dioptre)?

+7.5 D

-7.5 D

+2.5 D

+5.0 D

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NDA NA I 2017 Q106

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