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natural science > visible light > Flashcards

visible light Flashcards

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1
Q

what is luminous?

A

an object that gives off light or glows in dark

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2
Q

what is illuminated?

A

lit up

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3
Q

what is visible light?

A
  • an object that comes from a luminous source
  • can be observed by the naked eye
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4
Q

what is radiation?

A

the process where light moves away from its origin.

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5
Q

how is light transferred?

A

by radiation.

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6
Q

what happens when lights are switched on?

A

room becomes illuminated because bulb radiates in all directions.

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7
Q

why cant you see around a corner?

A

light travels in straight lines

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8
Q

what is a ray diagram?

A

a simplified way to show how light is radiated from a luminous object

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9
Q

what is a pinhole camera?

A
  • a pinhole camera illustrates that light travels in straight lines
  • forms an upside down image of a luminous object on a screen
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10
Q

what is the speed of light?

A

aproximateley 300 000 km per second

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11
Q

what is the distance from the earth to sun?

A

150 million km

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12
Q

what is the formula for distance?

A

time (seconds) x speed (km)

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13
Q

what is the formula for time?

A

distance (km) divided by **speed **(km/s)

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14
Q

what is the formula for speed?

A

distance (km) divided by time (seconds)

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15
Q

what is white light?

A

the combination of all the different colours of light

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16
Q

what is a spectrum of visible light?

A

the full collection of coulors that make up white light

17
Q

what is light called?

A

a wave

18
Q

what is a wave?

A

a pattern created by the repeated up and down or side to side movement of a medium which flows through it.

19
Q

what is a wavelength?

A

the length of one wave pattern

20
Q

what is frequency?

A

the number of waves that move past a certain point in one second

21
Q

what is white light made up of?

A

violet, indigo, blue, green, yellow, orange and red

22
Q

which colour has the shortest wave length?

A

violet

23
Q

which colour has the longest wave length and shortest frequency?

A

red

24
Q

what is light refraction?

A

the ability of a wave to change direction or bend when it passes from one medium to the other

25
Q

what happens when light shines on triangular prism?

A

each colour has own angle thus splitting white light refracted + dispersed into seven colours

26
Q

what is an opaque substance?

A

object that doesnt allow light to travel through it

27
Q

what happens to opaque objects?

A
  • light = absorbed or reflected
  • absorbed: light cannot travel further once reached
  • black objects absorb light
28
Q

where do shadows form?

A

the area behind opaque objects that recieve no light

29
Q

what are transparent substances?

A

objects where light is able to travel through the object

it can be absorbed or reflected

30
Q

explain how we see colour

A

if you have a coloured object, the other colours of the spectrum besides the colour of object will be absorbed and the colour of the object will be reflected

if all colour = absorbed, object = black

if all colour= reflected, object = white

31
Q

explain how you see yourself in the mirror

A
  • light from light source reflects on you
  • this light shines on mirror
  • when light is reflected it always changes direction
  • light reflects back to your eye
  • your brain reads that light ray traveled length of the two light rays together
  • the brain forms image a distance away
32
Q

what is the normal?

A

imaginary line on reflective surface that forms 90 degree angle on surface

33
Q

what is an incident ray?

A

light that travels through the reflective surface

34
Q

what is the reflected ray?

A

the light that is reflected from the the reflected surface

35
Q

what is the angle of incidence?

A

angle measured from the normal to incidence ray.

36
Q

what is the angle of reflection?

A

angle measured from the normal to reflected ray.

if surface = rough then reflection = scattered.

37
Q

draw a ray diagram

A
38
Q

draw refraction of light through a triangular prism

A
39
Q

draw refraction of light through convex lens

A

natural science (5 decks)

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