Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

EK physics > Chapter 5 (2) > Flashcards

Chapter 5 (2) Flashcards

1
Q

Light

A

transfer of energy through alternating electric and magnetic fields

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Photons

A

light emitted by electrons as they move from high to low energy states

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Energy of photon

A

E= hf

h= planks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How can electron be excited

A
  1. by many high speed particles
  2. absorbing a photon of light
  3. thermal agitation
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

visible light range

A

390 x 10^-9 to 700 x 10^-9

shorter wavelengths correspond to violet light, longer wavelengths correspond to red light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Electromagnetic spectrum

A

long, radio, micro, infrared, UV, X ray, Gamma

Long has high wavelength low frequency

Gamma has low wavelength and high frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Speed of light

A

C= E/B= 3.00 x 10^8 m/s

ratio of electric field to magnetic field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What causes light absorption

A

depends on medium and frequency of the wave as they move

absorbed when frequency matches resonant frequency of the medium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

polarized light

A

electric and magnetic fields are oriented in a certain way

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

refraction

A

light bending as it passes into a new medium

usually a lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

dispersion

A

splitting of light according to a frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

diffraction

A

spreading of light as it encounters an edge (interference when passing through a slit)

depends on size of object or opening relative or wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Angle of incidence

A

how light strikes a boundary/ interface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What happens when light reflects off a flat surface

A

angle of incidence (strike) equals angle of reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What affects refraction

A

depends on how speed of light changes when it enters a new medium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

index of refraction

A

n= c/v

light is slower in a medium

c= speed of light in a vacuum, v= speed of light in a medium

always greater than 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What does a larger index of refraction mean

A

light moves more slowly through a medium

wavelength becomes shorter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Snells law

A

n1sin theta1= n2sin theta2

predicts how change in speed will bend a light ray

theta 1 is incidence, theta 2 is refraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What happens when light moves from higher index to lower index of refraction

A

light begins to move faster and spreads out

light bends away from normal (perpendicular to surface)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Total internal reflection

A

caused when light comes from a higher index and the angle is very large

none refract, all reflect (critical angle is reached)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

critical angle formula

A

thata= sin-1 (n2/n1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

thin film interference

A

thin layer with a different index placed between two layers

-refracts: changes wavelength
-Reflects off denser: changes phase
- reflects off less dense: changes neither

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what causes thin film interference

A

phase change due to reflections off more dense

path length differences

wavelength changes associates with changes in media

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

When is diffraction significant

A

size of an object or opening
is small relative to the wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

How does deffracted light appear

A

constructive interference is bright, destructive is dark

26
Q

X ray diffraction

A

uses atoms of crystals to act as a natural diffraction grating

X rays scatter and create regular interference patterns

27
Q

thin lens

A

maximal thickness is small relative to the radius of curvature, object distance and image distance

28
Q

focal point

A

parallel light rays converge or appear to converge after reflecting off a mirror or passing through a lens

29
Q

real focus point

A

point at which light rays actually converge

30
Q

virtual focal point

A

point at which light appears to converge

31
Q

center of curvature

A

each point along mirrors surface is equidistant from center of curvature

32
Q

radius of curvature

A

distance between surface of mirror and center of curvature

smaller=sharper curve

33
Q

where is the focal point on a convex and concave mirror

A

concave focal point is front of mirror, convex focal point is behind the mirror

34
Q

focal length

A

distance between a mirror and its focal point

F=R/2

r= radius of curvature

35
Q

Lens strength

A

power, determined by focal length

p=1/f

Use F in meters

36
Q

Signs for focal length

A

positive= light travels to the focal point, convergers

negative= light does not actually travel there, divergers

37
Q

converging mirrors

A

reflect light to converge in front of mirror

concave

38
Q

converging lens

A

refracts light rats to converge at a point opposite the light source

convex

39
Q

behavior of diverging

A

spread out so that light rays never intersect

40
Q

diverging mirror

A

reflects light rays so that observer perceives them as converging on the opposite side of the mirror

convex

41
Q

diverging lens

A

refracts light so that they appear to converge at a point on the same side of the lens as the light source

concave

42
Q

Real image

A

from convergence of light rays

inverted, on same side as observer, positive

43
Q

virtual image

A

cannot be captured on a screen

produced by the apparent convergence of light rays

opposite, negative, upright, from diverging or converging

44
Q

When is a converger virtual vs. real

A

when object is located beyond the focal point, convergers make a real image (COMMON)

when object is placed within focal point, image is virtual (object is between focal point and mirror/lens)

45
Q

thins lens equation

A

relates image distance (di) from the mirror/lens and the object distance (d0) to the focal length

uses cm

1/f= 1/do + 1/di

or use p as do and q as di

46
Q

signs for focal distance

A

converging is positive, diverging is negative

47
Q

signs for object distance

A

positive if in right location

same side of observer for mirrors, opposite for lens

48
Q

signs for image distance

A

positive if real, negative if virtual

49
Q

p=f

A

no image is formed

50
Q

magnification

A

m= -(di/do)= (hi/ho)

51
Q

How do divergers magnify

A

always produce images that are smaller than object

52
Q

lens abberation

A

blurred images from theoretical images

53
Q

multiple lens magnification

A

m= m1*m2

54
Q

multiple lens power

A

Peff= P1 + P2…

55
Q

how does light work in eye

A

refracts incoming light so that it focuses on the area at the back of eye (retina)

56
Q

What parts of the eye bend light

A

cornea (bends the most) and the lens

bend light to converge at retina

57
Q

how does the eye focus light on near objects

A

muscle surrounding the lens contracts causing the lens to bulge and reducing the focal length of the lens

58
Q

myopia (what is it, how does it work improperly)

A

near sighted, see near objects clearly

good at bending light to focus on retina – bends light of far objects too sharply and converges in front of retina

59
Q

hyperopia

A

far sighted, cannot bend light properly

Far light rays are more parallel (do not need to be bent)

nearby rays are not bent- converges rays passed the retina

60
Q

How is myopia corrected

A

correct with diverging lens (spreads out light rays to focus on retina)

61
Q

how is hyperopia corrected

A

using a converging lens to make light rays closer to parallel

EK physics (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions