visible light
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what is luminous?
an object that gives off light or glows in dark
what is illuminated?
lit up
what is visible light?
• an object that comes from a luminous source • can be observed by the naked eye
what is radiation?
the process where light moves away from its origin.
how is light transferred?
by radiation.
what happens when lights are switched on?
room becomes illuminated because bulb radiates in all directions.
why cant you see around a corner?
light travels in straight lines
what is a ray diagram?
a simplified way to show how light is radiated from a luminous object
what is a pinhole camera?
• a pinhole camera illustrates that light travels in straight lines • forms an upside down image of a luminous object on a screen
what is the speed of light?
aproximateley 300 000 km per second
what is the distance from the earth to sun?
150 million km
what is the formula for distance?
time (seconds) x speed (km)
what is the formula for time?
distance (km) divided by **speed **(km/s)
what is the formula for speed?
distance (km) divided by time (seconds)
what is white light?
the combination of all the different colours of light
what is a spectrum of visible light?
the full collection of coulors that make up white light
what is light called?
a wave
what is a wave?
a pattern created by the repeated up and down or side to side movement of a medium which flows through it.
what is a wavelength?
the length of one wave pattern
what is frequency?
the number of waves that move past a certain point in one second
what is white light made up of?
violet, indigo, blue, green, yellow, orange and red
which colour has the shortest wave length?
violet
which colour has the longest wave length and shortest frequency?
red
what is light refraction?
the ability of a wave to change direction or bend when it passes from one medium to the other