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Refraction
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Key Concepts:
Terms in this set (23)
Refraction is the being or change in direction of light
What is refraction?
Light rays either slow down or speed up.
What happens when light rays moves from one medium to another?
3.00 x 10 to the eight m/s
What is the speed of light in a vacuum?
We use it because even though it is actually less, it is not less by very much.
Why is the speed of light we use for air the same as in a vacuum?
The medium itself.
What does the amount of how much the light will bend in any medium depend on?
The Index of Refraction.
What is the property of the medium known as?
the bigger.
The ____ the index of refraction, the more the light will bend.
They all lie on the same plane.
(Rule #1) Where do the incident ray, the refracted ray, and the normal all lie on?
Light will bend towards the normal. (i.e air to water)
(Rule #2) When the speed of light in the 2nd medium is less than the 1st medium, where does light bend in relation to the normal?
Light will bend away from the normal (i.e water to air)
(Rule #2) When the speed of light in the 2nd medium is greater than the 1st medium, where does light bend in relation to the normal?
When part of the wave is reflected and part of it is refracted.
What is partial reflection and refraction?
The ratio of the speed of light in a vacuum TO the speed of light in another medium (i.e. water, acrylic, oil, etc.)
What is the index of refraction?
You write everything in lower case.
How do you write the mathematical equations?
n = c/v
What is the mathematical equation for the index of refraction?
No.
Does n=c/v have a unit?
c = nv
What is the mathematical equation for the speed of light in a vacuum?
3.00 x 10 to the eight m/s
What is the value of c? (i.e. the speed of light in a vacuum)
m/s
What is the unit for c = nv
v = c/n
What is the mathematical equation for the speed of light in a medium? (i.e. water, acrylic, etc.)
m/s
What is the unit for v = c/n?
Since the units of speed cancel when calculated, the index of refraction is a dimensionless quantity. (no units)
What does the index of refraction become when calculated?
N can be determined by using light rays
What can n be determined by?
n = sin < i / sin < R
What is another mathematical equation we can use to determine the index of refraction?
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