Fiber optics are an important part of our modern internet. In these fibers, two different glasses are used to confine the light by total internal reflection at the critical angle for the interface between the core (ncore = 1.491 ) and the cladding (n cladding = 1.436). Required:
What is the largest angle (in degrees) a ray will make with respect to the interface of the fiber max, and still experience total internal reflection?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)

Do you think you could give me the answers to #29?