You and your dog are walking along a pond. Your dog looks into the still water and is startled to see its reflection. Which phenomenon is responsible for the appearance of the dog's reflection on the water's surface?
А. diffraction of water waves
B. reflection of lightwaves
C. refraction of lightwaves
D. reflection of water waves
E. refraction of water waves

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?