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Sound&light > Light > Flashcards

Light Flashcards

1
Q

Speed of light

A

300,000km/hr

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2
Q

What travels just as fast as light?

A

Electromagnetic radiation

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3
Q

What is light made up of?

A

Photons which are particles that travel as a wave

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4
Q

What kind of energy is light?

A

radiant energy

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5
Q

Purpose of the electromagnetic spectrum

A

To show us the different types of light

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6
Q

What kind of wave is light?

A

Transverse wave

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7
Q

What is light?

A

Energy that travels as an electromagnetic wave

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8
Q

When light hits a wave, what are the 3 things that can happen?

A

It can be transmitted, reflected or absorbed

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9
Q

What happens when light is transmitted

A

When light passes through the object

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10
Q

What happens when light is reflected

A

light bounces off the object

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11
Q

What happens when light is absorbed

A

When light is taken into the object

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12
Q

Transparent objects

A

Materials like glass that allow light to pass through them

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13
Q

Transculent objects

A
  • Objects that allow only some light to be pass-through

- can’t see through objects clearly like a foggy mirror or clouds

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14
Q

Opaque objects

A

Objects that absorb or reflect all light eg. concrete floor

or that light can’t pass through at all

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15
Q

What depends on how reflective an object is

A

how reflective an object depends on how smooth the surface is

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16
Q

Law of reflection

A

Angle of incidence=Angle of reflection

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17
Q

Incident ray

A

Ray of light that hits a surface

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18
Q

Angle of reflection

A

Angle between the reflected ray and the normal

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19
Q

Whats the normal

A

The imaginary line drawn perpendicular to the mirror

20
Q

Angle of incidence:

A

Angle between the incident ray and the normal

21
Q

Reflected ray

A

A ray of light that leaves the mirror

22
Q

Plane mirrors

A

Plane mirrors are flat mirrors that produce a virtual image

23
Q

refraction

A

is the bending of light rays that occur when light at angle travels from one medium to another of different density

24
Q

when does light bend

A

Light bends when it changes speed

25
Q

Virtual images

A

Images that are reversed

26
Q

Refracted Ray

A

The bent ray

27
Q

What happens when light enters a denser medium

A

The light ray slows down and bends towards the normal

28
Q

What happens when a light ray enters a less dense medium

A

The light ray speeds up and bends away from the normal.

29
Q

The lower the refractive index….

A

The less dense the medium is and the faster light travels through it.

30
Q

When does the light not bend?

A

Light doesn’t bend when it enters a new medium of 90 degrees.

31
Q

Convex lenses

A

Convex lenses at the centre than the edges and cause light rays to converge.

32
Q

The focus point

A

Where the rays meet or cross

33
Q

Concave lenses

A

Concave lenses are thinner at the centre than at the edges and cause light rays to diverge

34
Q

What is the result of refraction

A

the bending of light rays

35
Q

Lens

A

A curved piece of transparent material such as glass or plastic

36
Q

Focal length of convex lens

A

Focal length is the distance from the focus to the middle of the lens for the convex lens

37
Q

Focal length of concave lense

A

Focal length is from the left side of the focus to the middle of the lense

38
Q

What lens has a virtual focus point

A

Concave lens

39
Q

What does the amount of refraction depend on

A

The amount of refraction that takes place depends upon the angle that the light ray hits the surface of an object. Lenses make use of this to bring rays to a point.

40
Q

What is a magnifying lens

A

Concave lens

41
Q

What should a ray diagram start with

A

A light source

42
Q

how refraction of light through transparent materials occurs,

A

Transparent materials have a less dense medium causing light rays to speed up. When light rays speed up they refract.

43
Q

how refractive index determines if the light is refracted towards or away from the normal.

A

Whether the light rays bend towards or away from the normal is determined by the refractive index. When light rays enter a denser medium, they bend towards the normal and when they enter a less dense medium they bend away from the normal.

44
Q

Light sensitive back of the eye

A

Retina

45
Q

Rocks at the bottom of a stream always look like they are in shallower water than they actually are. This is caused by?

A

refraction

Sound&light (4 decks)

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