(e)Define power of a lens .How is it related to the focal length of the lens?
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The focal length of the lens tells you how far away from the lens a focused image is created, if light rays approaching the lens are parallel. A lens with more “bending power” has a shorter focal length, because it alters the path of the light rays more effectively than a weaker lens.
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Power of lens is defined as the reciprocal of the focal length of the lens expressed in meter. SI unit of power is Dioptre denoted by D. Since the focal length is positive, so it is a convex lens. Since the focal length is negative, so it is a concave lens.
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