Chapter 6.5, Problem 6E

2. (a) State Fermat's principle for the propagation of a light ray from point P at (x1,y1) to Q at (x2, y2), expressing the principle as a problem in Calculus of Variations. (b) Suppose c(y) is the speed of light in a medium, given by c(y) Y where a is a constant. Find the path of a light ray between the points P: (−1,3) and Q (1, 3). Is there more than one possible path? (c) Sketch the path of the light ray, and interpret what an observer at Q would see if there were a light source at P.

A. 90.6 square meters B. 91.4 square meters C. 92.5 square meters D. 93.7 square meters

An ice cream cone is 10cm deep and 4cm across the opening of the cone. Two sphere-shaped scoops of ice cream, which also have diameters of 4cm, are placed on top of the cone. Use π≈3.14 and round your answers to the nearest hundredth.a) What is the volume of the cone?    cubic centimetersb) What is the total volume of the two sphere-shaped scoops of ice cream?    cubic centimeters