Unit 1:Optics Flashcards Preview

Grade 10 Science > Unit 1:Optics > Flashcards

Flashcards in Unit 1:Optics Deck (108):
1

The production of light as a result of high temperature

Incandescence

2

The process of producing light by passing an electric current through a gas

Electric Discharge

3

The process of producing light by the absorption of ultraviolet light resulting in the emission of visible light over an extended period of light

Phosphorescence

4

The immediate emission of visible light as a result of the absorption of ultraviolet light

Fluorescence

5

The direct production of light as the result of a chemical reaction with little or no heat produced

Chemiluminescence

6

The production of light in living organisms as the result of a chemical reaction with little/no heat produced

Bioluminescence

7

The production of light from friction as a result of scratching, crushing, or rubbing crystals

Triboluminescence

8

Light produced as a result of an electric current flowing in semiconductors

Light Emitting Diodes(LED)

9

Is a device that creates and amplifies a narrow, intense beam of coherent light

Laser

10

Define incident light

Light emitted from a source that strikes an object

11

Define translucent object

Material transmits some incident light and absorbs or reflects the rest. Objects can not be clearly see through the material

12

Define transparent object

Material transmits all, or almost all, incident light. Objects can be clearly seen through the material

13

Define opaque object

Material does not transmit any incident light, rather it absorbs or reflects all of it. Objects can not be seen at all

14

Define reflection

The bouncing back of light from a surface

15

Define incident ray

A ray of light that travels toward the reflecting surface

16

Define angle of incidence

The angle between the incident ray and the normal

17

Define the reflected ray

A ray of light that bounces off a reflecting surface

18

Define the angle of reflection

The angle between the reflected ray and the normal

19

Define the normal

The line drawn from the point of incidence at 90* to the surface of the optical device

20

What is the point of incidence

The POI is the spot where the incident ray strikes the reflecting surface

21

What are the 2 laws of reflection

1. The angle of incidence will equal the angle of reflection

2. The incident ray, the reflected ray and the normal all lie in the same place

22

Define Specular Reflection

Reflection of light off a smooth surface

23

Define Difuse Reflection

Reflection of light off an irregular or dull surface

24

Define virtual image

An image formed by light coming from an apparent light source; light is not actually arriving at or coming from the image location

25

What is the object-mirror line perpendicular to?

The mirror surface

26

T or F

The distance from the object to the mirror is exactly the same as the distance from the image to the mirror

T

27

What does SALT stand for and explain

-Size of the image( same size, smaller or larger)
-Attitude of the image(upright or inverted)
-Location of the image
-Type of image(real or virtual)

28

Describe SALT for plane mirrors

Same size
Laterally inverted
Behind the mirror
Virtual

29

What is another word for concave mirror

Converging

30

Define concave mirror

A mirror shaped like part of the surface of a sphere in which the inner surface is reflective

31

What is another word for convex mirror

Diverging

32

Define convex mirror

A mirror shaped like a part of the surface of a sphere in which the outer surface is reflective

33

Define the centre of curvature(C)

Centre of sphere

34

Define the Principal axis(PA)

The line passing through the centre of curvature to the midpoint of a mirror(normal)

35

Define the vertex(V)

Point where the principal axis meets the mirror

36

Define the focus(F)

The point where light rays that are parallel to the principal axis meet, after being reflected off the mirror

37

Define focal length(f)

The distance from the vertex to the focal point(f=cv/2)

38

Give 3 rules for drawing ray diagrams

Use an upright arrow to represent the object

Show real rays as solid lines

Show virtual rays as dashed lines

39

T or F
Any ray that is parallel to the principal axis will reflect through the focal point on a converging mirror

T

40

Where do you draw the real image on a ray diagram for concave mirrors

Where the 2 rays intersect

41

What type of images do convex mirrors produce

Smaller, upright, located behind the mirror, virtual

42

Define refraction

The bending of light as it goes from one medium into another

43

What happens when light passes from one medium into another

It changes speed

44

Like _________ waves, of the wave strikes a new medium at an angle it changes ___________

Water

Direction

45

What is the speed of light

3.00x 10 to the power of 8 m/s

300 000 000

46

Give the 3 rules of refraction

1. A ray directed along the normal line does not refract
2.light bends towards the normal when the speed of light in the second medium is less than the speed of light in the first medium
3. Light bends away from the normal when the speed of light in the second medium is greater

47

What does index of refraction stand for

n

48

What does speed of light in a vacuum stand for

c

49

What does speed of light in a medium stand for

v

50

What is the formula for index of refraction

n=c/v

51

Explain what speed of light in a vacuum means

How fast light can travel when nothing else is around to slow it down (outer space)

52

Define index of refraction

Is a measure of how much a medium slows down light as it passes through

Be between 1.0-3.50

53

What formula is used for calculating the index of refraction by the sines of the angles

N2/N1 = sina/sinB

54

T or F

The larger the index of refraction the more the medium increases the speed of light

Decreases

F

55

What is the index of refraction in a vacuum

1.00

56

What does GRASP stand for

Given

Requirements

Analysis

Solutions

Paraphrase

57

What happens to the angle of refraction when the angle of incidence increases

Increases

58

What is the critical angle

Is the angle of incidence which causes the light to retract at 90 degrees

59

What happens when an incident ray is beyond the virtual angle

All the light is reflected

60

Define total internal reflection

When the angle of incidence is beyon the critical angle and all light is reflected

61

What happens when an angle of incidence is less than the critical angle

The light will be refracted

62

Define absorption

Changing from light to heat energy

63

What are radio waves used for

Communications

64

What are microwaves used for

Tech used in food prep

65

What is infrared light used for

Remote controls

66

What is visible light used for

Vision

67

What is ultra violet light used for

Killing microtganisms and tanning

68

What is x-rays used for

Scanning

69

What are gamma rays used for

Medical imaging

70

What does luminous mean

That objects produce their own light

71

What types of rays do we use in lens

Refracted rays

72

Imagine the 3 types of rays for converging lenses

Check notes

73

What is the optical centre

The centre of the lens

74

What is the principal focus for lenses

The point where light rays travelling parallel to the principal axis converge after refraction

75

What are emergent rays

Light that leaves the lens after refraction

76

What is the secondary principal focus for diverging lenses

Side of the lens where the rays diverge

77

Imagine the 3 types of ays for diverging lens in your head

Check notes

78

Define converging lens

Lens that causes incident parallel light rays to converge through a single point after refraction

79

Define diverging lens

Lens that causes incident parallel light rays to diverge after refraction from the lens

80

What does D0 stand for

Distance from object to optical centre

81

What does Di stand for

Distance from image to optical centre

82

What does ho stand for

Height of object

83

What does hi stand for

Height of image

84

What does f stand for

Focal length of lens

85

What is the Thin Lens Equation

1/do + 1/di = 1/f

86

What is do always

Positive

87

When is di positive

Real images

88

When is di negative

Negative for virtual images

89

When is it a real image for converging/diverging mirrors

Opposite side of the object

90

When is it a virtual image for converging/diverging lenses

Same side as object

91

When is f positive

Converging lenses

92

When is f negative

Diverging lenses

93

When are hi and ho positive

When upright

94

When are hi and ho negative

When inverted

95

When is M positive

Upright

96

When is M negative

When inverted

97

M=...

Hi/ho = -di/do

98

What is the iris

Opens and closes around a central hole to let in more or less light (coloured part)

99

What is the pupil

The hole in the iris through which light enters the eye

100

T or F
The displayed pupil is large
The constricted pupil is small

T

101

What is the cornea

Is the transparent bulge on top of the pupil that focuses light

102

What does the Retina do

Makes u see things upside down

103

What is Myopia

Near sightedness

See things close but not far

104

What is hyperobia

Far sightedness
Can see things far but not close

105

What is astigmatism

Light focuses on more than one point in the eye, causing blurred vision (close or far)

106

What does LASIK do

Uses lasers to change the shape of the cornea to improve vision

107

What does the optical nerve create

A blind spot at the back of the eye

108

How do eye muscles focus on far and close objects

By slightly changing the shape of the eye lens