define the following
1) focal length
2)power of a lens
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The power of a lens is defined as the reciprocal of the focal length. Lens poweris measured in dioptres (D). Converging (convex ) lenses have positive focal lengths, so they also have positive powervalues. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values
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Focal length : the distance between the centre of a lens or curved mirror and its focus.
Power of a lens : The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).
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