optics unit 1 test

Question 1

what is light?

Answer 1

visible light is an electromagnetic wave (electromagnetic spectrum, classified by energy)

Question 2

2 ways to describe light

Answer 2

wave and particle

Question 3

all waves travel at the speed of

Answer 3

3.00x10>8 m/s

Question 4

higher frequency equal

Answer 4

higher energy

Question 5

order of spectrum from slowest to fastest

Answer 5

radio waves
microwaves
infrared light
visible light (smallest section)
ultra violet light
x-rays
gamma rays

Question 6

visible light is apart of the spectrum that can be seen by the human eye (T/F)

Answer 6

True

Question 7

light released by the sun

Answer 7

UV (ultraviolet light) causes sunburns and reactions

Question 8

light needs a medium to travel (T/F)

Answer 8

false

Question 9

examples of radio waves

Answer 9

AM/FM radio
TV signals
cellphone communication

Question 9

examples of radio waves

Answer 9

AM/FM radio
TV signals
cellphone communication

Question 10

what type of light are:
remote controls
laser
physical therapy

Answer 10

infrared light

Question 11

examples of visible light

Answer 11

human vision
concert lighting
rainbows

Question 12

what type of light are:
microwave ovens
telecommunications
astronomy

Answer 12

microwaves

Question 13

what is an example of all types of light except visible light?

Answer 13

astronomy

Question 14

x-rays

Answer 14

medical imaging
security equipment
cancer treatment

Question 15

what type of light are:
cancer treatment
product of some nuclear decay

Answer 15

Gamma rays

Question 16

what region is visible light on the electromagnetic spectrum

Answer 16

380nm to about 750nm

Question 17

relation between colour an speed of light

Answer 17

larger the number slower the wave length
lower the number faster the wave length
red = slow
purple = fast

Question 18

8 ways light is produced
I Eat Pigs For Church Because They Love

Answer 18

incandescence
electric discharge
phosphorescence
fluorescence
chemiluminescence
bioluminescence
triboluminescence
LED’s

Question 19

incandescence

Answer 19

light produced by something that has reached a high temp
(lava/fire)
cooler the object the redder it is
eventually
hotter object the bluer it is
glowing

Question 20

incandescence light bulb

Answer 20

tungsten filament heats up with elec current and glows

Question 21

electric discharge

Answer 21

light produced by elec current passing through gas
diff gasses produce different colours of light

Question 22

elec discharge pattern of colours

Answer 22

glowing red
red deep orange
purple
blue
light blue/white

Question 23

phosphorescence

Answer 23

light produced by chem phosphorus
these materials can store and absorb UV light energy
energy absorbed is released as lower energy visible light
diff materials = diff periods of time energy stored

Question 24

fluorescence

Answer 24

the immediate admission of visible light as a result of UV light have mercury atoms that release UV light when light hits fluorescent material visible light is created (detergents contain fluorescent dyes)

Question 25

chemiluminescence

Answer 25

direct production of light as the result of a chem reaction with little or no heat produced (glowsticks)

Question 26

bioluminescence (think bio)

Answer 26

result of chem reactions within a living organism that releases visible light (firefly) = produce an enzyme called luciferase that starts the reaction that produces light

Question 27

triboluminescence (cheating person)

Answer 27

production of light when crystals are scratched crusted or rubbed CaF2 and ZnS

Question 28

LED's light Emiting diodes

Answer 28

produce light as a result of a one way current flowing through semi conductors

Question 29

light travels in

Answer 29

straight lines represented with an arrow on it showing direction of travel

Question 30

what is the use of light rays to determine the path of light when it strikes objects

Answer 30

geometric optics

Question 31

transparent

Answer 31

light completely passes through

Question 32

translucent

Answer 32

some light passes through (absorb/reflects the rest)

Question 33

opaque

Answer 33

no light passes through (absorbs/reflects all light)

Question 34

what is a mirror?

Answer 34

polished surface able to create an image

Question 35

what is an image?

Answer 35

reproduction of an object using light

Question 36

light hits the _____ and is ______ or ______ back, which allows for the creation of the _______

Answer 36

mirror bounced reflected image

Question 37

what are mirrors made out of?

Answer 37

clear glass and layer of film (piece of metal as backing)

Question 38

incident ray

Answer 38

incoming ray that strikes a surface

Question 39

reflected ray

Answer 39

bounces off reflected surface

Question 40

the normal

Answer 40

perpendicular to mirror

Question 41

angle of incidence

Answer 41

angle between incident ray and normal

Question 42

angle of reflection

Answer 42

angle between reflected ray and normal

Question 43

laws of reflection

Answer 43

1. angle of incidence = angle of reflection 2. incident rays, reflected ray , and the normal all line in the same plane

Question 44

specular reflection

Answer 44

reflection of light off a smooth surface

Question 45

diffuse reflection

Answer 45

reflection of light off of irregular or dull surface

Question 46

SALT

Answer 46

S = size of image A = attitude of image (upright/ inverted) L = location of image T = type of image (real/virtual)

Question 47

shape of mirror results in

Answer 47

new type of image

Question 48

concave mirrors

Answer 48

convergence: where light rays end up meeting at a specific point called the focus

Question 49

concave mirrors diagram easy

Answer 49

1 parallel then through focus 2 center of curvature reflected back onto itself 3 through focus then parallel (opp of 1) 4 ray aimed at vertex following LOR (think normal mirror)

Question 50

light behind C concave (parallel through focus) (focus through parallel)

Answer 50

smaller inverted between C and F real

Question 51

light on C concave

Answer 51

same size inverted at C real

Question 52

light between C and F concave

Answer 52

larger inverted behind C real

Question 53

light on F concave

Answer 53

no image formed reflected rays are parallel 2nd line goes through vertex bc its on F

Question 54

light in front of F concave

Answer 54

behind mirror larger upright virtual line through center of curvature to top of light source continues behind mirror 2nd line through vertex bc in front of F

Question 55

convex mirrors

Answer 55

diverging light rays = spread apart on contact with mirror (always virtual and smaller images)

Question 56

convex mirror diagram easy

Answer 56

1 parallel diverge off in line with focus 2 in line with C back onto itself 3. in line with focus then parallel (opp of 1)

Question 57

what is C F and line

Answer 57

C = center of curvature F = focus line = principle axis/ normal