Q.13 What is the meant by power of a lens
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Power of lens is known as the inverse of the focal length of the lens measured in meter(m). S.I unit of power = Dioptre (D) Power of lense = 1/ focal length in meter. The focal length of 1st lense f1 = 40 cm = 0.4 m. The lense used is a convex lens because the focal length is a positive value.
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The efficiency with which a lens can converge or. diverge the light ray. The reciprocal of focal length of the lens is called the power of the lens (P).
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