Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
35 Cards in this Set
- Front
- Back
|
Light is a form of
|
energy
|
|
|
Remember, light(a form of energy) cannot be created or destroyed; it can only be
|
transformed
|
|
|
Light can look like 2 different things:
|
a wave and a particle
|
|
|
What are light's wavelike properties
|
propagation & interference
|
|
|
What are light's particlelike properties
|
emission & absorption
|
|
|
What is the speed of light?
|
c = 3E8
|
|
|
What is the wave equation for the speed of light?
|
c = fλ
|
|
|
What is the definition of reflection
|
some or all of a wave bounces back into the 1st medium when hitting a boundary of a 2nd medium
|
|
|
What is TOTAL REFLECTION
|
when all the wave energy is reflected back instead of being TRANSMITTED
|
|
|
What is PARTIAL REFLECTION
|
if SOME energy is transmitted and some is reflected
|
|
|
What is specular reflection
|
reflection from a smooth surface
|
|
|
What is diffuse reflection
|
reflection from a rough surface
|
|
|
In Geometric Optics, light waves are considered to move in
|
straight lines
|
|
|
What do we use to show how light propagates?
|
rays
|
|
|
When a light strikes a mirror, we know it reflects (total reflection), what can we say about the angle of incidence & the angle of reflection?
|
they are equal
|
|
|
What does tanϴ =
|
tanϴ = sinϴ/cosϴ
|
|
|
What does sin^2ϴ + cos^2ϴ =
|
1
|
|
|
what is refraction
|
the bending of light as it passes from one transparent material to another
|
|
|
When light hits a more dense medium (air to water) it will
|
slow down
|
|
|
When a light hits a more dense medium (air to water) and as it slows down, the --
|
light bends
|
|
|
Who is snell's law named after
|
Willebrord Snell, Dutch physicist and mathematician, discovered law of refraction in 1621
|
|
|
What does Snell's Law say
|
n1sinϴi = n2sinϴr
|
|
|
What does n=
|
n = c/v(medium)
|
|
|
What IS n
|
index of refraction
|
|
|
what does v(medium) mean
|
means velocity of light in medium
|
|
|
What does N(air) =
(velocity of light in air) |
1.00
|
|
|
What does N(water) =
(velocity of light in water) |
1.33
|
|
|
What does ϴr =
|
ϴr = sin^1(n1sin(ϴi))/n2)
|
|
|
What does Polarization do
|
Only lets certain light through
|
|
|
Give me 3 examples of refraction AND EXPLAIN each of them
|
-a prism: splitting white light into multiple colors of light
-a straw in cup: straw looks bent -a fish in water: looks farther away than it really is |
|
|
When light passes at an angle to the normal from one material into another material in which its speed is higher, it bends _____ the normal
|
towards
|
|
|
When light passes at an angle to the normal from one material into another material in which its speed is lower, it bends ____ the normal
|
away from
|
|
|
How does white light passing through a prism produce a visible spectrum (rainbow)?
|
The light bends as it passes from one transparent material to another
|
|
|
Compare and Contrast reflection & refraction
|
-Reflection is when some or all of a wave bounces back into the 1st medium when hitting a boundary of a 2nd medium.
-Refraction is the bending of light as it passes from one transparent material to another |
|
|
When light passes at an angle to the normal from one material into another material in which its speed is changed, what happens? TALK ABOUT BOTH POSSIBILITIES.
|
Changed:
FASTER: hits a less dense medium it will speed up SLOWER: hits a more dense medium it will slow down |
