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chapter 29 homework
|What is light that bounces back a particle or wave that strikes a a boundary between two media?
|What does the law of relfection state?
|It says that the angle of incidence is equal to the angle of reflection.
|What is the normal?
|A line perpendicular to the point where the incident ray strikes the barrier and is drawn as a dashed line.
|What kind of image does a plane mirror produce?
|A plane mirror produces only virtual images.
|What kind of image does a concave miror produce and, what kind of mirrors are concave?
|A concave mirror produces an image that curves outward. A makeup mirror is a type of concave mirror.
|What is diffuse reflection?
|Diffuse reflection is the reflection of light from rough objects.
|What are reverberations and what do they have to do with acoustics?
|Reverberations are multiple rections of sound, and they help balance sound in an audiotorium or concert hall.
|What is refraction?
|The bending of a wave as it crosses the boundary between two media at an angle.
|What kind of image does a convex mirror produce, and what kinds of mirrors are convex?
|A convex mirror produces an image that curves inward. A security mirror and a traffic control mirror are two different kinds of convex mirrors.
|What is the difference between light that is totally reflected and light that is partially reflected?
|Light that is totally reflected has all of it's light bounce back, and partially reflected light only has some. Also, light that is totally reflected needs a very rigid second surface while the partially reflected light only needs a less rigid surface.
|When light shines perpendicularly on the surface of still water what percent is reflected?
|What is a real image?
|It is always inverted. Concave mirrors seen from far away are real images. They are formed by converging light rays and are displayed on a screen.
|What is an image?
|It is a likeness or reproduction of an object.
|What kind of image does a plane mirror produce, and what kinds of mirrors are plane?
|A plane mirror produces a flat image. Bathroom mirrors and dressing room mirrors are plane mirrors.
|Whether a surface is a diffuse reflector or a polished reflector depends on what?
|The wavelength of the wave it reflects.