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GCSE Physics 🪐 > Light And The Electromagnetic Spectrum > Flashcards

Light And The Electromagnetic Spectrum Flashcards

1
Q

What are the two types of lens?

A
  1. Convex
  2. Concave
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2
Q

What are convex lenses used for?

A

Correcting long sight

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3
Q

What are concave lenses used for?

A

Correcting short sight

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4
Q

What do concave lenses do?

A

Diverges the rays

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5
Q

What is the symbol for concave lenses?

A

¥
I

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6
Q

What do convex lenses do?

A

Converges the rays

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7
Q

What do convex lens look like?

A

<————->

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8
Q

What is the focal point?

A

The point where the light seems to have come from

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9
Q

What is the focal length?

A

Distance between the centre of the lens and the focal point

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10
Q

The more powerful the lens…

A

The shorter the focal length

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11
Q

Powerful lenses tend to be…

A

More curved

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12
Q

What are the 3 rules for ray diagram construction?

A
  1. Parallel ray
  2. Central ray
  3. Focal ray
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13
Q

What 3 things do you need to decide on ray diagrams?

A
  1. Orientation (inverted or upright)
  2. Real or virtual
  3. Size compared to object (magnified or diminished)
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14
Q

How do you identify real images?

A

Can be projected on a screen, virtual images cannot be

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15
Q

Problem with short sight?

A

Eyeball is too long, too powerful lens, image focussed before retina

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16
Q

Problem with long sight?

A

Eyeball too short, too weak lens, image focussed behind retina

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17
Q

How do we see?

A

Light from luminous objects reflects off objects into our eyes

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18
Q

What can happen to light?

A

Refracted
Reflected
Transmitted
Absorbed

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19
Q

What is white light made up of?

A

A spectrum of all the colours of the rainbow

20
Q

What is needed to investigate white light?

A

Prism
Raybox

21
Q

What are the primary colours of light?

A

Red
Green
Blue

22
Q

What are the secondary colours of light?

A

Cyan
Yellow
Magenta

23
Q

Why is light in a spectrum?

A

The different colours of light have different wavelengths, so they are refracted by different amounts

24
Q

What colour is refracted the most and why?

A

Violet
Shorter wavelength

25
Q

What colour is refracted the least and why?

A

Red
Longer wavelength

26
Q

What do coloured objects do?

A

Absorb all of the colours of the spectrum except the colour of the object itself which it reflects

27
Q

Why are white objects white?

A

Reflect all colours

28
Q

Why are black objects black?

A

Absorb all colours

29
Q

What do coloured filters do?

A

Absorb all the colours of the spectrum except the colour of the filter itself which they transmit

30
Q

What are all em waves?

A

Transverse

31
Q

What do all em waves travel at?

A

The speed of light

32
Q

What can all em waves travel through?

A

Vacuum (space)

33
Q

What is the em spectrum?

A

Radio, microwave, infrared, visible light, ultraviolet, X-ray, gamma rays

34
Q

What is the frequency of visible light?

A

8 x 1014 - 4 x 1014

35
Q

What is the wavelength of visible light?

A

370 nm- 740nm

36
Q

Radio - gamma
What happens to wavelength?

A

Decreases

37
Q

Radio - gamma
What happens to frequency?

A

Increases

38
Q

Radio - gamma
What happens to frequency?

A

Increases

39
Q

Radio - gamma
What happens to energy?

A

Increases

40
Q

What are gamma rays used for?

A

Nuclear bombs

41
Q

What are X-rays used for?

A

Seeing bones

42
Q

What are ultraviolet rays used for?

A

Getting a sun tan

43
Q

What are infrared rays used for?

A

TV remote

44
Q

What do microwaves do?

A

Cooking food

45
Q

What do radio waves get used for?

A

Listen to radio

GCSE Physics 🪐 (4 decks)

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