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Science - Light > Light > Flashcards

Light Flashcards

1
Q

What is an object that gives off its own light?

A

Luminous Object

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2
Q

Whats an object that doesn’t give off its own light?

A

Non luminous object

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3
Q

Describe how light travels

A

In straight lines in all directions at 300,000,000 meters per second

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4
Q

State the Law of Reflection

A

The angle of reflection is equal to the angle of incidence

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5
Q

Describe the effect that a concave curved mirror has on parallel rays of light

A

The reflected light rays converge and come to a focal point

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6
Q

Describe the effect that a convex curved mirror has on three parallel light rays

A

The reflected light rays diverge

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7
Q

What is total internal reflection

A

Total internal reflection is when light travels through a transparent material such as an optical fibre by reflecting off the inside surface

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8
Q

Provide three examples of uses of fibre optics

A

Surgical uses such as a Laparoscopy. Transmiting data at 200MPS and can also be used to see hard to reach places such as pipes and sewers.

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9
Q

What happens when light enters a glass block

A

It refracts towards the normal as it enters the block and away from the normal as it exits the block

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10
Q

What is the Law of refraction?

A

The angle of refraction is smaller than the angle of incidence when it goes from air into glass

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11
Q

What causes long or short sight?

A

It is caused by the eyeball being too long or short

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12
Q

If someone’s eyeball is too long where is the image focused?

A

The image is focused in front of the retina. This means they are short sighted.

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13
Q

If someone’s eyeball is too short, where is the image focused?

A

The image is focused behind the retina. This means the person is long sighted.

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14
Q

What is the definition of incidence ray?

A

Its a ray of light that is going to a mirror or surface.

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15
Q

What is the angle of incidence?

A

The angle of incidence is the angle between the incidence ray and the surface normal.

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16
Q

What’s the reflected ray?

A

The reflected ray is the ray coming from the mirror or surface

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17
Q

What is the angle of reflection

A

Its the angle between the reflected ray and the surface normal

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18
Q

What is the surface normal

A

Its the dotted line at a 90° angle to the surface

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19
Q

What are the colours in the visible light spectrum in order

A

Red, Orange, Yellow, Green, Blue, Indigo, Violet

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20
Q

Explain Newtons experiment to find the visible colour spectrum

A

Newton used a prism to disperse the beam of white light into the diffrent colours of the light spectrum.

21
Q

What are the three primary additive colours

A

Red, Green and Blue

22
Q

What colour do you get when you combine red and green

A

Yellow

23
Q

What colour do you get when you mix green and blue?

A

Cyan

24
Q

What colour do you get when you mix blue and red?

A

Magenta

25
Q

What colour do you get when you mix red,green and blue

A

White

26
Q

List the Electro Magnetic spectrum from shortest to longest wave length

A

Gamma, X- ray, UV, Visible, Infared, Microwave, Radiowave

27
Q

State a use of radio waves

A

Radio and TV

28
Q

State a danger of radio waves

A

None

29
Q

State a use of microwaves

A

Cooking, signals, phones

30
Q

State a danger of microwaves

A

Heat body tissue

31
Q

State a use of infrared light

A

Night vision, security, remote controls

32
Q

State a danger of infrared

A

Skin burns

33
Q

State a use of visible light

A

Cameras, seeing

34
Q

State a danger of visible light

A

None

35
Q

State a use of ultraviolet light

A

Sanatisation,Sunbeds, security

36
Q

State a danger of UV light

A

Burns, skin cancer, damages eyes

37
Q

State a use of x-rays

A

X-ray machines

38
Q

State a danger of xrays

A

Damage cells, cancer

39
Q

State a use of gamma rays

A

Sterelising things, cancer therapy

40
Q

State a danger of gamma rays

A

High exposure kills cells

41
Q

What is the difference between concave and convex lenses

A

A concave lens is skinnier in the middle than at the sides, a convex lens is the inverse.

42
Q

What is the approximate size of a radio wave

A

Buildings/10^3m

43
Q

What is the approximate size of microwave rays

A

Humans/10^-2m

44
Q

What is the approximate size of infrared light

A

Needle point/10^-5m

45
Q

What is the approximate size of visible light

A

Protozoans/0.5x10^-6m

46
Q

What is the approximate size of UV light

A

Molecules/10^-8

47
Q

What is the approximate size of x-rays

A

Atoms/10^-10m

48
Q

What is the approximate size of gamma rays

A

Atomic nuclei/10^-12m

Science - Light (1 decks)

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