Review

Question 1

What is light?

Answer 1

Light is a fast moving energy wave consisted of electric and magnetic waves

Question 2

What is the speed of light in a vacuum?

Answer 2

3.00 x 10^8 m/s

Question 3

How does light travel?

Answer 3

In a straight line

Question 4

What is a medium

Answer 4

A medium is a physical substance that can transfer energy.

water, air, glass

Question 5

What is frequency?

Answer 5

The number of wavelengths per unit of time (Hz)

Question 6

What is a wavelength

Answer 6

The distance between one waves crest and another

Question 7

What is the electromagnetic spectrum?

Answer 7

It measures the frequency, energy, and wavelength of the types of electromagnetic waves

Radio waves —> gamma rays

Question 8

What is the order of the electromagnetic spectrum

Long to short wavelengths

Answer 8

Radio                 Long
Microwave
Infrared
Visible
Ultraviolet
X-ray
Gamma.             Short

Question 9

What is the order of the electromagnetic spectrum

Highest to lowest frequency

Answer 9

Gamma.           High
X-ray
Ultraviolet
Visible
Infrared
Microwave
Radio.               Low

Question 10

What is a use of radio waves

Answer 10

Cell phone, radio, tv

Question 11

What is a use of microwave rays

Answer 11

Microwave ovens

Question 12

Some uses for infrared waves

Answer 12

Remote controls, lasers

Question 13

Uses of visible light

Answer 13

Human sight, rainbows

Question 14

Ultraviolet uses

Answer 14

Skin tanning, black lights, skin cancer risk

Question 15

X-ray uses

Answer 15

Cancer treatment, medical imaging

Question 16

Gamma rays uses

Answer 16

Cancer treatment

Question 17

What are the two sources of light?

Answer 17

Luminous- creates its own light

Non luminous- does not create its own light

Question 18

What are the types of light?

Answer 18

Incandescence
Electric discharge 
Phosphorescence fluorescence 
Chemiluminescence 
Bioluminescence 
LED
Laser

Question 19

What does L.A.S.E.R. stand for?

Answer 19

Light amplification by stimulated emissions of radiation

Question 20

What’s the first law of reflexion?

Answer 20

The angle of incidence is equal to the angle of reflection

Question 21

What is the 2nd law of reflection

Answer 21

The incidence, reflected, and normal all lie on the same plane

Question 22

What are the two types of reflections?

Answer 22

Specular- smooth surface like a mirror

Diffuse- irregular/ dull surface

Question 23

What is refraction

Answer 23

Refraction happens when light travels from one medium into a different one

Question 24

What does SALT stand for?

Answer 24

Size
Attitude
Location
Type

Question 25

What are the two types of curved mirrors

Answer 25

Concave- curved away from object Convex- curved toward object

Question 26

Rules for locating images in concave mirrors

Answer 26

1- rays parallel to the principal axis reflect through the focus 2- rays going through the focus will reflect parallel to the principal axis 3- rays through the centre will reflect on themselves 4- rays that hit the vertex will follow the 1st rule of reflection

Question 27

What is the salt when the object is placed... Behind C

Answer 27

Smaller Inverted Between C and F Real

Question 28

What is the salt when the object is placed... Between C and F

Answer 28

Bigger Inverted Behind C Real

Question 29

What is the salt when the object is placed... Inside F

Answer 29

Bigger Upright Behind mirror Virtual

Question 30

What is the salt when the object is placed... On C

Answer 30

Same size Inverted At C Real

Question 31

What is the salt when the object is placed... On F

Answer 31

No clear image

Question 32

What are the rule of convex mirror reflections

Answer 32

1- Ray parallel to principal axis will reflect as if it came from F 2- Ray aimed towards F will reflect parallel to principal axis 3- Ray aimed at C will reflect on itself

Question 33

What is the salt of an object in a convex mirror

Answer 33

Smaller Upright Behind mirror Virtual

Question 34

Rules of refraction

Answer 34

1- incidence, normal, and refracted Ray are all in the same plane 2- when speed decreases, light will bend toward the normal 3- when speed increases, light will bend away from the normal

Question 35

What is an index of refraction

Answer 35

Amount by which a medium decreases the speed of light It has no units Air has the lowest index 1.00 while water is 1.33

Question 36

How do you find the index of refraction

Answer 36

N= C _________ V C is the speed of light in air N is the speed of light in any medium

Question 37

What is total internal reflection

Answer 37

If the angle of incidence is greater than the critical angle, then there will be a reflection instead of a refraction

Question 38

How do rainbows work

Answer 38

Rays of light refract as they enter water droplets which causes dispersions (the different colours) water refracts again once it can leave and forms the rainbow we know

Question 39

How do mirages work

Answer 39

Temperature can change the index of refraction of air. if the ground ins hotter than the sky, a gradient is created and when light is refracted it created a virtual image

Question 40

What are the rules for images in converging lenses

Answer 40

1- Ray parallel to principal axis will refract through the focus 2- Ray goes through F and refracts parallel to principal axis 3- Ray goes straight through optical centre

Question 41

What is the salt of an image in a converging image if.... It is beyond 2F'

Answer 41

Smaller Inverted Between 2F and F Real

Question 42

What is the salt of an image in a converging image if.... It is at 2F'

Answer 42

Same size Inverted At 2F Real

Question 43

What is the salt of an image in a converging image if.... Between 2F' and F

Answer 43

Bigger Inverted Beyond 2F Real

Question 44

What is the salt of an image in a converging image if.... At F'

Answer 44

No clear image

Question 45

What is the salt of an image in a converging image if.... Inside F'

Answer 45

Bigger Upright Beyond 2F' Virtual

Question 46

Rules for locating an image in a diverging lens

Answer 46

1- Ray parallel to principal axis is refracted as if it came from F 2- Ray that is aimed at F' refracted parallel to principal axis 3- Ray that goes through optical centre will continue

Question 47

What is the only salt of any image in a diverging lens

Answer 47

Smaller Upright Same side as object Virtual