A convex-convex lens has radii of curvature with magnitudes of |R_1| = 10\, \rm cm and |R_2| =15\, \rm cm. The lens is made of glass with index of...

A convex-convex lens has radii of curvature with magnitudes of |R_1| = 10, rm cm and |R_2| =15, rm cm. The lens is made of glass with index of refraction n_{rm glass}=1.5. We will employ the convention that R_1 refers to the radius of curvature of the surface through which light will enter the lens, and R_2 refers to the radius of curvature of the surface from which light will exit the lens.What is the focal length of the lens if it is immersed in water (n_{rm water}=1.3)?