What is the focal length of the lens if it is immersed in water(nwater=1.3)? A biconvex lens

What is the focal length of the lens if it is immersed in water(nwater=1.3)?

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A "biconvex" lens is one in which both surfaces of the lens bulge outwards. Suppose you had a biconvex lens with radii of curvature with magnitudes of |R₁| = 10 cm and |R₂| = 15 cm. The lens is made of glass with index of refraction nglass = 1.5. We will employ the convention that R₁ refers to the radius of curvature of the surface through which light will enter the lens, and R₂ refers to the radius of curvature of the surface from which light will exit the lens. A "biconvex" lens is one in which both surfaces of the lens bulge outwards. Suppose you had a biconvex lens with radii of curvature with magnitudes of |R₁| = 10 cm and |R₂| = 15 cm. The lens is made of glass with index of refraction nglass = 1.5. We will employ the convention that R₁ refers to the radius of curvature of the surface through which light will enter the lens, and R₂ refers to the radius of curvature of the surface from which light will exit the lens.

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