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chapter 29 homework
Question | Answer |
---|---|
What is light that bounces back a particle or wave that strikes a a boundary between two media? | Reflected |
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? | 2% |
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. |