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3 cards from this section. Quick, good the night before a test.
What is a wavefront?
Think of it as the surface of a balloon expanding.
Name the three types of wavefronts.
Consider different shapes of wave propagation.
What type of wavefront is produced by a point light source?
Think of how ripples form in water.
Light rays are always normal to wavefronts.
Visualize how lines would intersect a flat surface.
Design an experiment to visualize how wavefronts interact at a boundary between air and water. What would you expect to observe?
Consider drawing ray diagrams to illustrate path changes.
If the distance from the point source increases, how does the shape of the wavefront change and what implications does it have for light intensity?
Think about how the light's spread affects brightness.
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