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Physics > Observing Light > Flashcards

Observing Light Flashcards

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1
Q

Light

A

Something that stimulates sight and makes things visible

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2
Q

Luminous

A

Something which gives off light:
The sun
Stars
Lightning

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3
Q

Non-Luminous

A

Something which reflects light, but doesn’t give it off:
The moon
Glass
Metal

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4
Q

Rectilinear Propagation

A

When light travels in straight lines

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5
Q

Shadows

A

a dark area or shape produced by a body coming between rays of light and a surface

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6
Q

Large light sources…..

A

Produces shadows with penumbras/larger penumbras

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7
Q

Small Light sources…..

A

Produce shadows with smaller penumbras or no penumbras

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8
Q

Light can travel through….

A

vacuums - space is a vacuum, and we can see stars and stuff, so light can travel through it

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9
Q

Light can not…

A

escape a black hole

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10
Q

Sound can’t travel through….

A

Vacuums

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11
Q

If a white light is shone onto a green ball, what colour would it be?

A

Green, because white is made up of RGB, and the green ball reflects green and absorbs red and blue

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12
Q

A green light it shone onto a red ball, what would the colour be?

A

Black, because the light is giving out green, but the red ball only reflects red and it absorbs the other colours, so it would appear black.

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13
Q

True or false, light refracts as it enters the prism

A

True

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14
Q

What is refraction?

A

The bending of light or change in direction of light

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15
Q

Dispersion is when…

A

Light spilts into colours of the spectrum

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16
Q

why do we see the flash of lightning before we hear thunder?

A

Light travels faster than sound

17
Q

pinhole cameras

A

The image produced is shown upside-down

18
Q

Where would you put a film in a pinhole camera?

A

Behind the screen

19
Q

Umbra

A

total eclipse - the darkest part of a shadow

20
Q

Penumbra

A

partial eclipse - the less dark ish part - usually grey or fuzzy

21
Q

size and appearance, things that affect it

A

Distance between object and light-source
Distance between object and screen
Size of the object
Size of the screen

22
Q

Emission

A

Light given out

eg. A light bulb - it gives out light, but light doesn’t go through it and out the other side

23
Q

Transmission

A

When light passes through

eg. Glass - light goes through glass

24
Q

Reflection

A

When light bounces off an object

25
Q

Absorption

A

When light is taken in or stopped.

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