Monday homework problem 13.10 as part of a possibly over planned wedding reception, you want to make alcohol lenses to focus light for a romantic visual effect. the lenses are plano-convex with one flat surface and one convex surface. the curved surface has radius 60cm. the index of refraction of alcohol is 1.361. compute the focal length of the lens. note, since you are using 100 proof alcohol, this is a spectacular fire hazard.