Q: A lens has a power of +2·0 Dioptre. Which one of the following statements about the lens is true?
(a)The lens is concave and has a focal length of 0·5 metre
(b)The lens is convex and has a focal length of 2·0 metre
(c)The lens is convex and has a focal length of 0·5 metre
(d)The lens is concave and has a focal length of 2·0 metre
Answer pending verification