# Shared Flashcard Set

## Details

Chapter 29: Reflection and Refraction Questions
Chapter 29: Reflection and Refraction Questions
26
Physics
01/07/2012

Term
 Reflection is when a wave reaches the boundary between two media and _________ ______ into the first medium?
Definition
 bounces back
Term
 At a boundary, part of a wave is usually _____________ and part usually passes into the second medium.
Definition
 reflected
Term
 State the law of reflection.
Definition
 The angle of incidence = the angle of reflection.
Term
 A plane mirror forms a virtual image or a real image?
Definition
 Virtual image
Term
 In a plane mirror, the image appears to be as far in back of the mirror as the object in front of it, and is the _______ ________ as the object.
Definition
 same size
Term
 Light that falls on a rough surface is reflected _______________
Definition
 diffusely
Term
 When a wave reaches the boundary between two media and changes direction as it passes into the second medium it is called ________________
Definition
 refraction
Term
 Refraction is caused by a difference in the ________ of the light wave in two media.
Definition
 speed
Term
 The speed of light in materials depends on _______________, causing the different colors that make up white light to refract differently and spread out to form a visible spectrum.
Definition
 frequency
Term
 Explain total internal reflection.
Definition
 An incident wave on a boundary is at an angle such that none of the wave can be refracted, so only reflection occurs.
Term
 When waves remain in one medium and reverse directions it is called ___________________.
Definition
 reflection
Term
 Does the law of reflection apply to partially reflected waves or totally reflected waves?
Definition
 Both
Term
 When you have an image at a position where _______ does not start, you have a virtual image.
Definition
 light
Term
 If you wish to take a picture of your image while standing 2m in front of a plane mirror for what distance would you set your camera to provide sharpest focus?
Definition
 4m
Term
Definition
 When light is incident on a rough surface
Term
 What are reverberations?
Definition
 Multiple reflections. Happens when the walls are too reflective or hard.
Term
 When designing a concert hall, which is more desirable, reverberation or absorption of sound?
Definition
 A balance
Term
 Sound and light obey/don't obey the same law of reflection.
Definition
 obey
Term
 If you can ________ an instrument in an orchestra either reflected or unaided, you can hear it if it is played loudly enough.
Definition
 see
Term
 Any continuous portion of a 2-D or 3-D wave in which the vibrations are all the same way at the same time is called a __________ _________.
Definition
 wave front
Term
 A floating image that appears in the distance and is due to the refraction of light in Earthâ€™s atmosphere is called a __________.
Definition
 mirage
Term
 The separation of light into colors arranged according to their frequency by interaction with a prism or diffraction grating is called ____________.
Definition
 dispersion
Term
 If light traveled at the same speed in raindrops as it does in air, would we still have rainbows?
Definition
 No. If there is no change in speed there is no refraction. If there is no refraction, there is no dispersion of light and hence, no rainbow!
Term
 The minimum angle of incidence for which a light ray is totally reflected within a medium is called the ______________ _______________.
Definition
 critical angle
Term
 The 100% reflection (with no transmission) of light that strikes the boundary between two media at an angle greater than the critical angle is called _______ ________ ________.
Definition
 total internal reflection
Term
 A transparent fiber, usually of glass or plastic that can transmit light down its length by means of total internal reflection is called ____________ ___________.
Definition
 optical fiber
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