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The radii of curvature of two surfaces of a double convex lens are 10 cm each. Calculate its focal length and power of the lens in air and liquid. Refractive indices of glass and liquid are 1.5 and 1.8 respectively.

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Radius of curvature of first surface R1 = 10 cm 

Radius of curvature of second surface R2 = 10 cm In air

pl = -3.33 d

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