Which of the following is an example of speed only?
a. 25 kilometers per hour (25 km/h)
b. 45 miles per hour to the east (45 mph to the east)
c. 60 meters per hour per second (60 m/h s)

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =