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Chapter 29 Con Phys
Reflection and Refraction
| Question | Answer |
|---|---|
| Refraction is... | the bending of a wave as it crosses the boundary between two media at an angle. |
| Sound waves are refracted when... | parts of a wave front travel at different speeds. |
| When the layer of air near the ground is colder than the air above, the speed of sound near the ground is... | reduced |
| When light ____________ it bends towards the normal | slows down |
| A mirage is caused by... | the refraction of light in Earth's temperature. |
| The speed of light in air is only __________ less than the speed of light in a vacuum, but in some situations atmospheric refraction is quite noticeable. | 0.03% |
| A mirage is formed by ___________ light and can be photographed. | real |
| Different frequencies of light travel a different speeds in transparent materials, they will... | refract differently and bend at different angles. |
| ____________________ is the separation of light into a range of colors according to their frequencies. | Dispersion |
| In order to see a rainbow, the sun must be shining in one part of the sky, and... | the water droplets in a cloud or in falling rain must be in the opposite part of the sky. |
| Total reflection occurs when the angle of ____________________ is larger than the critcal angle. | incidence |
| Total internal reflection occurs when... | the angle of incidence is larger than the critical angle. |
| The critical angle is... | the angle of incidence at which the light is refracted at an angle of 90 degrees with respect to the normal. |
| Water waves travel ______________ in deep water than in shallow water. | faster |
| Sound refraction occurs when... | uneven winds or when sound is traveling through air of uneven temperature.. |
| Waves are partly reflected and partly refracted when they fall on a ______________________ medium. | transparent |
| ______________ is the bouncing back of a particle or wave that strikes a boundary between two media. | Reflection |
| When all of the wave's energy bounces back and the second medium is very rigid the wave is ___________________ reflected. | totally |
| When some of the wave's energy bounces back, but some moves into a new medium and the second medium is less rigid the wave is ___________ reflected. | partially |
| A light wave that strikes a boundary is an ______________________ wave. | incident |
| It's path is drawn as a straight line arrow is an __________________ ray. | incident |
| A light wave that bounces off a boundary is an ____________________ wave. | reflected |
| A line drawn perpendicular to the point where the incident ray strikes the barrier and drawn as a dashed line is the _______________. | normal |
| The Law of Reflection states... | the relationship between these two angles, the angle of incidence equals the angle of reflection. |
| A ________ image appears to be in a location where light does not really reach. | virtual |
| _____________ mirrors produce only virtual images. | Plane (always right side up) |
| A mirror that is a virtual image and curves outward, it is smaller and closer to the mirror than the object is _______________. | convex |
| A mirror that curves inward, the virtual image is larger and farther away than the object is ________________. | concave |
| Examples of plane mirrors are | bathroom mirrors and dressing room mirrors |
| Examples of convex mirrors are | security mirrors, traffic control mirrors, and passenger side mirrors |
| Examples of concave mirrors are | makeup mirrors |
| An image is... | a likeness or a reproduction of an object. |
| ____________ images in mirrors are images that seem to be in or behind the mirror and are always upright. | virtual |
| ____________ images are formed by converging light rays and can be displayed on a screen and these images are always inverted. | real |
| Different frequencies of light travel at different speeds in transparent materials, they will... | refract differently. |
| What is a mirage caused by? | the refraction of light in Earth's atmosphere. |
| Sound energy that is not reflected is... | absorbed or transmitted |
| When does total internal reflection occur? | When the angle of incidence is larger than the critical angle. |
| What causes refraction? | changes in the speed of light as it passes from one medium to another, or variations in the temperatures and densities of the same medium, cause refraction. |
| the return of a wave back into its original medium | Reflection |
| a line perpendicular to a surface | Normal |
| the angle between the incident ray and the normal | angle of incidence |
| describes the relationship between the angle of incidence and the angle of reflection | law of reflection |
| What type of image is a a plane mirror? | virtual |
| What type of image is a convex mirror? | virtual |
| What type is of image is a concave mirror when it is close up and when it is far away? | close up=virtual and far away=real |
Created by:
ebyness
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