Which of the following occurs as light travels farther from its source?
a. the source gives off less light as photons move away from it.
b. far from the source, photons spread over a larger area.
c. the intensity of light increases as photons move away from the source.
d. far from the source, photons come together in a small area.

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.