2014 Refraction -Interactions of Light Directed

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Name ________________________________________
SECTION 22-3 “INTERACTIONS OF LIGHT WAVES: REFRACTION”
Directed Reading pages 646-648
REFRACTION
1) . The bending of a wave as the wave passes at an angle from one substance to another is called
_____________________________.
2). What causes the speed of light to vary? ________________________________________________
____________________________________________________________________________________
3). Is the speed of light traveling in a vacuum slower or faster than the speed of light traveling through
matter?___________________________________________________________
4). What happens when a wave enters a new material at an angle? _________________________
________________________________________________________________________________
________________________________________________________________________________
5). Does the light passing into a material where the speed of light is
lower bend toward or away from the boundary between the
materials?____________________________________________
6). If light passes into a material where the speed of light is faster,
does the light bend toward or away from the boundary between
the materials?
_______________________________________________________________________
7). How does the refraction of light as it passes from the air into water cause optical illusions?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
__________________________________________________________________________________
REFRACTION and COLOR SEPARATION
8). When white light is refracted, the amount that light bends depends upon its wavelength.
Which bend more—light waves with short wavelengths or light waves with long wavelengths?
___________________________________________________________________________________
9). How are rainbows created?___________________________________________________________
____________________________________________________________________________________
___________________________________________________________________________________
___________________________________________________________________________________
10). What is a prism? _________________________________________________________________
___________________________________________________________________________________
A. REFRACTION AND OPTICAL ILLUSIONS
1. Your brain always interprets light as traveling in a
___________________________________ from
the object to your eye.
2. But, light reflecting from an object underneath the water _______________________
reflect in a
straight line.
3. Refraction causes objects to appear _______________ and __________________than
they really are.
B. REFRACTION AND COLOR SEPARATION
1. White light is composed of all the__________________________________________.
2. The different wavelength are seen as ________________________________
3. When white light is refracted, the amount that the light bends depends on its
____________________.
a. Waves with a _________________ wavelength bend more than waves with a
_________________
wavelength.
b. A prism separates white light into the ________________ of visible light by
refraction.
c. Rainbows are formed when sunlight is refracted by
________________________________.
IV.
DIFFRACTION
1. Diffraction is the bending of
waves______________________________________________________
2. The amount a wave diffracts depends on its ____________________and the size of the
____________
_________________________________________________
a. Diffraction is greatest when the barrier or opening is the ______________ or
__________________
than the wavelength.
A. DIFFRACTION AND WAVELENGTH
1. Visible light’s wavelength is very small so it cannot diffract much unless it passes through
a ________
_________________, around __________________________, or around a
______________________
2. Light does not diffract ___________________ large objects, so you can’t see around
corners.
3. But, light waves ___________________ diffract
a. Diffraction causes the edges of _____________________ to be blurry.
V. INTERFERENCE
1. Interference happens when two or more waves ____________________________
2. Can be _______________________ or ________________________
A. CONSTRUCTIVE INTERFERENCE
1. The resulting wave has a greater _________________ or ____________ than the
individual waves had.
2. Can be seen when light of one wavelength shines through two small holes onto a screen.
The light on
the screen will appear as a series of
______________________________________________________
3. The brighter bands are the result of _____________________________
C. Destructive Interference
1. The resulting wave has a _________________________ amplitude than the individual
waves.
2. The result is _____________________ light. It forms ______________ bands in the
diagram above.
3. Since light is made up of many different wavelengths, the wavelengths
________________ line up for you to see constructive or destructive interference.
SUMMARY
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______________________
.
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