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Prov '23 > Physics Light Test > Flashcards

Physics Light Test Flashcards

1
Q

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

A

Empedocles

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2
Q

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

A

Euclid

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3
Q

Is light a wave or a particle?

A

both

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4
Q

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

A

Roemer

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5
Q

How fast does light travel?

A

300,000 km/s

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6
Q

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.

A

Michelson

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7
Q

What is a light year? How fast?

A

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

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8
Q

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

A

7-8

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9
Q

The range for Visible Light

A

400-700 nm

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10
Q

Long wavelength=______ freq

A

low

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11
Q

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

A

Infrared

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12
Q

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

A

Ultraviolet (UV)

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13
Q

Photons

A

Particles of light

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14
Q

Transparent

A

Light passes through

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15
Q

Opaque

A

Light absorbs or reflects

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16
Q

what colors are included in white?

A

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

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17
Q

What is black?

A

the absence of light

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18
Q

Light is an _______ color

A

additive colors

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19
Q

pigments are _____ colors

A

Subtractive colors

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20
Q

Why is the sky blue?

A

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

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21
Q

Why are sunsets red?

A
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22
Q

Why is the sea blue-green?

A

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

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23
Q

Reflection vs. Refraction

A

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

24
Q

Can reflection & refraction happen at the same time?

A

yes

25
Q

Incident ray

A

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

26
Q

Reflected ray

A

What bounces off the reflection

27
Q

Normal ray

A

The imagery line that is perpendicular to the reflective surface

28
Q

What is the angle of incidence & reflection?

A

equal to eachother

29
Q

What kind of images do we get from mirrors?

A

virtual

30
Q

Why do things refract?

A

the speed changes

31
Q

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

A

below, because everything appears shallower?

32
Q

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

A

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

33
Q

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

A

The middle is thicker than the edges, converge

34
Q

Concave

A

The edges are thicker than the middle, diverge

35
Q

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

A

The middle is thicker than the edges, converge

36
Q

Principal axis

A

the line joining the center of the curvature

37
Q

what kind of image can be projected on a screen?

A

Real

38
Q

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

A

it will never focus

39
Q

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

A

outside 2, real

40
Q

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

A

Real on 2

41
Q

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

A

inbtw 1&2 real

42
Q

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

A

Real on 2

43
Q

Eye is too small

A

Hyperopia, farsighted, converging lens

44
Q

Eye is to big

A

Myopia, nearsighted, diverging lens

45
Q

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

A

Real on 2

46
Q

How are we able to see blue?

A

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

47
Q

What are complementary colors

A

When you add the two colors together, they make white

48
Q

Best mirrors are those that are ______

A

smooth

49
Q

Plane Mirror

A

Mirrors without irregularities

50
Q

Diffuse reflections

A

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

51
Q

Does light speed up or slow down in water?

A

slow down

52
Q

Mirages:

A

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

53
Q

Focal Length:

A

distance from the middle of the lens and the focal point

54
Q

Magnifying glass/lens: creates a ______- image

A

virtual

55
Q

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

A

presbyopia

Prov '23 (26 decks)

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