Find the optical power and the focal lengths (a) Of a thin glass lens in liquid with

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Find the optical power and the focal lengths
(a) Of a thin glass lens in liquid with refractive index no = 1.7 if its optical power in air is Ф0 = 5.0 D;
(b) Of a thin symmetrical biconvex glass lens, with air on one side and water on the other side, if the optical power of that lens in air is Ф0 = + 10 D.
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