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Solihull School - Shells > Light > Flashcards

Light Flashcards

1
Q

How does light travel?

A

In straight lines

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2
Q

What does luminous mean?

A

An object that emits light

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3
Q

What does emit mean?

A

Another word for gives out

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4
Q

What does transparent mean?

A

You can see through the object - because light is not absorbed

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5
Q

What does translucent mean?

A

Light scatters through the object

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6
Q

What does opaque mean?

A

You cannot see through the object. The object absorbs or reflects the light.

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7
Q

What is a vacuum?

A

Empty space. There are no particles.

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8
Q

What is a medium?

A

A material

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9
Q

How fast is light?

A

300,000,000 metres per second

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10
Q

What type of wave is light?

A

Transverse wave

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11
Q

Does light need a medium?

A

No

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12
Q

How long does it take for light to travel from the Sun to Earth?

A

8 minutes

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13
Q

Where is light absorbed?

A

In your eyes

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14
Q

What does transmit mean?

A

Travels

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15
Q

What does non-luminous mean?

A

An object that does not emit light

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16
Q

What is a plane mirror?

A

A mirror with a flat reflective surface

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17
Q

What is the imaginary line at 90 degrees to the surface of a material called?

A

The normal

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18
Q

What is reflection off a smooth surface called?

A

Specular reflection

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19
Q

What is reflection off a rough surface called?

A

Diffuse scattering

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20
Q

State the law of reflection

A

The angle of incidence is equal the angle of reflection

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21
Q

What is the ray that reflects off a mirror called

A

The reflected ray

22
Q

Reflected images are always the wrong way round - this is called? L_______ I________

A

Laterally Inverted

23
Q

What is a virtual image?

A

An image that is not formed on a screen

24
Q

If an object is 25 cm infront of a mirror, how far away will the virtual images appear behind the mirror?

A

25 cm

25
Q

What is refraction?

A

When light changes direction when it changes medium

26
Q

When does refraction occur?

A

When light travels from one transparent medium to another transparent medium (ie water to glass)

27
Q

Why does refraction occur?

A

As light changes speed when it goes from one medium to another

28
Q

What is a lens?

A

An object that focuses light to a single point

29
Q

What is a convex lens?

A

A lens that bring light together to a single point

30
Q

What is a converging?

A

A lens that spread light apart

31
Q

What does the retina do?

A

It form the image

32
Q

What does the pupil do?

A

Transmits light

33
Q

Is the cornea transparent or opaque?

A

Transparent

34
Q

What are the two types of photoreceptors?

A

Rods and cones

35
Q

What does inverted mean?

A

The image is upside down

36
Q

Where does light enter a pinhole camera?

A

The pinhole

37
Q

What happens when light hits the rods and cones?

A

Chemical reactions produce electrical signals that travels up the optic nerve to your brain

38
Q

Where is the optic nerve?

A

At the back of the eye

39
Q

What does CCD stand for?

A

charge-coupled device

40
Q

What is the eye version of the CCD in a camera?

A

The retina

41
Q

What is the camera version of the iris in the eye?

A

The apeture

42
Q

What are the primary colours?

A

Red, Blue, Green

43
Q

What are the secondary colours?

A

Cyan, Yellow, Magenta

44
Q

Why are objects a certain colour?

A

When white light hits an object, it absorbs certain colours and only reflects the colour of the object

45
Q

What do fliters do to light?

A

A red filter subtracts all colours from white light apart from red

46
Q

Why does a green object look black in red light?

A

As the red light is asborbed by the green object. The green object will only reflect green light.

47
Q

What can split white light into a spectrum of colours?

A

A prism

48
Q

State the colours in order

A

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

49
Q

Which colour has the highest frequency?

A

Violet

50
Q

Which colour has the lowest frequency?

A

Red

Solihull School - Shells (7 decks)

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