The best example of diffraction is the image of a) your face as it appears in a mirror. b) a pencil that appears broken in a glass of water. c) a ring around the sun caused by particles in the air. d) a fingerprint that appears to be enlarged under a magnifying glass.

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?