1- An equi convex lens has an index of 1.8, radii of 4cm and a thickness of 3.6cm calculate (a) the focal length, (b) the power, and (c) the distances from the verticies to the corresponding focal points and principal points. Sol: a) f= 3.13 cm b) p=31 D c) AlF=-1.87 cm AlH= 1.25 cm A2F"= 1.88 cm A2H"=-1.25 cm
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