Physics Light Test

Question 1

What Philosopher claimed light came out of your eyes, struck the object, and then came back to your eyes

Answer 1

Empedocles

Question 2

What philosopher claimed light travels in straight lines and reflects from a surface at the same angle at which it hit it.

Answer 2

Euclid

Question 3

Is light a wave or a particle?

Answer 3

both

Question 4

Who first calculated how fast light was traveling in 1675 by looking at moons

Answer 4

Roemer

Question 5

How fast does light travel?

Answer 5

300,000 km/s

Question 6

Who set up an octagon of mirrors, one far away at the top of a mountain and the octagon at the bottom. The octagon set a light to the mountain and then the light came back. He measured the speed of light.

Answer 6

Michelson

Question 7

What is a light year? How fast?

Answer 7

how far light can travel in a year
6 trillion miles per year

Question 8

Only take about ______ minutes for the light from the sun to hit the earth

Answer 8

7-8

Question 9

The range for Visible Light

Answer 9

400-700 nm

Question 10

Long wavelength=______ freq

Answer 10

low

Question 11

Waves that are too long to see (f is too low)

Answer 11

Infrared

Question 12

Waves that are too short to see (f is too high)

Answer 12

Ultraviolet (UV)

Question 13

Photons

Answer 13

Particles of light

Question 14

Transparent

Answer 14

Light passes through

Question 15

Opaque

Answer 15

Light absorbs or reflects

Question 16

what colors are included in white?

Answer 16

Red, orange, yellow, green, blue, indigo, violet

Question 17

What is black?

Answer 17

the absence of light

Question 18

Light is an _______ color

Answer 18

additive colors

Question 19

pigments are _____ colors

Answer 19

Subtractive colors

Question 20

Why is the sky blue?

Answer 20

Energy comes in causing molecules in the atmosphere to vibrate, since they vibrate fast (high frequency) they appear blue

Question 21

Why are sunsets red?

Question 22

Why is the sea blue-green?

Answer 22

Every color but blue-green is being absorbed, but blue-green is being reflected

Question 23

Reflection vs. Refraction

Answer 23

Reflection is when light bounces
Refraction is when light bends due to change in speed

Question 24

Can reflection & refraction happen at the same time?

Answer 24

yes

Question 25

Incident ray

Answer 25

The ray of light that comes from the real image (what is being created)

Question 26

Reflected ray

Answer 26

What bounces off the reflection

Question 27

Normal ray

Answer 27

The imagery line that is perpendicular to the reflective surface

Question 28

What is the angle of incidence & reflection?

Answer 28

equal to eachother

Question 29

What kind of images do we get from mirrors?

Answer 29

virtual

Question 30

Why do things refract?

Answer 30

the speed changes

Question 31

When spearfishing, should you aim above or below? Why?

Answer 31

below, because everything appears shallower?

Question 32

If you wanted to hit something in the water with a laser light? Would you aim, above, below, or right on the object? Why

Answer 32

Right on the object because the light bends at the same speed as the light in the water

Question 33

What is a Convex lens? Whats another name for it?

Answer 33

The middle is thicker than the edges, converge

Question 34

Concave

Answer 34

The edges are thicker than the middle, diverge

Question 35

What is a Convex lens? What's another name for it?

Answer 35

The middle is thicker than the edges, converge

Question 36

Principal axis

Answer 36

the line joining the center of the curvature

Question 37

what kind of image can be projected on a screen?

Answer 37

Real

Question 38

If you draw a ray diagram with a line on the 1 focal point, what is true of the new image?

Answer 38

it will never focus

Question 39

If you draw a ray diagram with a line inbtw 1 & 2 focal point, what is true of the new image?

Answer 39

outside 2, real

Question 40

If you draw a ray diagram with a line on the 2 focal point, what is true of the new image?

Answer 40

Real on 2

Question 41

If you draw a ray diagram with a line on the outside 2 focal point, what is true of the new image?

Answer 41

inbtw 1&2 real

Question 42

If you draw a ray diagram with a line on the 2 focal points, what is true of the new image?

Answer 42

Real on 2

Question 43

Eye is too small

Answer 43

Hyperopia, farsighted, converging lens

Question 44

Eye is to big

Answer 44

Myopia, nearsighted, diverging lens

Question 45

What is true of the new image if you draw a ray diagram with a line on the 2 focal point?

Answer 45

Real on 2

Question 46

How are we able to see blue?

Answer 46

it is absorbing everything but the combination of light that look blue.

Question 47

What are complementary colors

Answer 47

When you add the two colors together, they make white

Question 48

Best mirrors are those that are ______

Answer 48

smooth

Question 49

Plane Mirror

Answer 49

Mirrors without irregularities

Question 50

Diffuse reflections

Answer 50

If there are irregularities in the surface, the light will bounce around and go in different directions.

Question 51

Does light speed up or slow down in water?

Answer 51

slow down

Question 52

Mirages:

Answer 52

the hot molecules are rising and moving. Because they are rising it makes it so that the light from the sky doesn’t go straight down it bends (refraction) and makes it look like water

Question 53

Focal Length:

Answer 53

distance from the middle of the lens and the focal point

Question 54

Magnifying glass/lens: creates a ______- image

Answer 54

virtual

Question 55

What eye condition is from Muscles are worn out so the lens doesn’t move as much (old eye)

Answer 55

presbyopia