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A lens is a transparent polished body bounded on two sides by curved surfaces. In particular, one of the surfaces maybe plane. Spherical lenses have spherical surfaces as bounds. Converging lenses convert a parallel beam of incident rays into a convergent beam.
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Explanation: N = mg = 40
(fs )max = μN = (0.8) (40) = 32
f s = ext. force = 30
R2 = N2 + fs 2 = (50)2
R = 50 N.
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