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physics- -29
chapter 29 flashcards
| Question | Answer |
|---|---|
| reflection | the bouncing back of a particle or wave that strikes the boundary between two media |
| normal | a line perpendicular to a surface |
| Angle of incidence | angle between an incident ray and the normal to a surface |
| Angle of reflection | Angle between a reflected ray and the normal to a surface is equal to the angle of reflection this is true for both partially and totally reflected waves |
| virtual image | An image formed through reflection or refraction that can be seen by an obsever but cannot be projected on screen because light from the object does not actually come to a focus |
| diffuse reflection | the reflection of waves in many directions from a rough surface |
| reverbation | persustence of a sound as in echo due to multiple reflections |
| refraction | the change in direction of a wave as it crosses the boundary between two media in which the wave travels at differnt speeds. |
| wave front | the crest though or any continous portion of a two dimensional or three dimensional wave in whicih the vibrations are all the same way at the same time |
| mirage | a floating image that appears in the distance and is due to the refraction of light in Earths atmostphere |
| dispersion | the seperation of light into colors arranged according to their frewuency by interaction with a prism or diffraction grating gratting for an example |
| critical angle | the minimum angle of incidence for which light ray is totally reflected within a meduim |
| total internal reflection | the 100% reflection of light that strikes the boundary between two media at an angle greater than the critical angle |
| opticcal fiber | a transparent fiber usually of glass or plastic that can transmit light down its length by means of total internal reflection |
| the angle of incidence equals the angle of ______ a.0 reflection b.0normal c. perpendicular | a. reflection |
| plane mirrors only produce... a. curved images b. virtual images c. fake images | b. virtual images |
| true or flase: the iage that appears in the mirror is farther away than it appears to be. | false, the image is the same distance |
| true or flase: convex mirrors are smaller and closer to the mirror than the object is | true |
| true or false: convex bends inward | false. the convex mirrors bend outward |
| what are some examples of convex mirrors? | security mirrors and traffic control mirrors |
| true or false: concave mirrors bend inward | true |
| true or false concave mirrors virtual image is larger and closer than the object is | true |
| what are some examples of concave mirrors? | makeup mirrors |
| what happens to light when it strikes a metal surface? | qalmost all of the energy is reflected back |
| what happens to light when it stikes glass or water? | some of the energy is reflected and some is transmitted through the glass or water |
| when light strikes a flat mirror at a certain angle predict the path of the reflected light | the light reflects at the same angle but opposite directions |
| when you view yourimage in a ________mirror your image is the same distance and as you are. a. convex b. concave c. plane | c. plane |
| true or false: the sound in a too reflective room sound garbled | true |
| true or false: the sounding in a too absorbent room sound dull and lifeless | true |
| name three exmples of refraction that we can see | 1. ponds ir swimming pools appear to be more shllow than they actually are 2. a pencil appears bent in water 3. the air above a hot stove seems to shimer |
| three conditions that would cause refraction? | 1. changes in the speed of light as it passes to meduimms 2. variations in the temperature 3. and densities of the same meduim |
| true or false: refraction only occurs in sound waves. | false, refraction also occurs in light waves |
| name three examples of uses for optical fibers | 1. mechanics to look inside engines 2. doctors to see in a patients body 3. communications |
| light that bounces off an object is... 1. reflected 2.refracted 3. incidence | reflected |
| true or false a term that means to bring light rays together is called converge | true |
| true or false a term that means spread light rays is called converge | false, diverge |
| a flat mirror is called a..... mirror | plane |
| true or false: concave mirrors focus light rays to a point | true |
| ______ mirros spread light rays a. plane b. convex c. concave | b. convex |
| in a _________ mirror you see a smaller upright image | convex |
| in a ___________ mirror you see a larger upright image | concave |
| give an example of a concave mirror | flashlights use them makeup mirrors |
| give an example of a convex mirror | security mirror passsenger rear veiw end mirror |
| inverted image is a ____-image | real |
| an upright image is always an _____ image | virtual |
| true or false: reflection from a rough surface is said to be a polished surface | false, diffused reflection |
Created by:
MNoonan15