Why the power of lens is measured as reciprocal of focal length?
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Answer:
So, a lens of higher power would converge or diverge light rays to a greater extent. ... Thus, the relation between power and focal length is inverse such that power is given as thereciprocal of the focal length of alens.
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Explanation:
concave lens of very short focal length causes higher divergence than one with longer focal length.the degree of convergence or divergence of light rays acheived by a lens is expressed in terms of power.
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