UPSC NDA I and II 2020 General Ability Solved Paper

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Question : 142 of 150

Marks: +1, -0

A lens has a power of +2.0 Dioptre. Which one of the following statements about the lens is true?

The lens is concave and has a focal length of 0.5 metre
The lens is convex and has a focal length of 2.0 metre
The lens is convex and has a focal length of 0.5 metre
The lens is concave and has a focal length of 2.0 metre

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