WHat is LIGHT? Flashcards
light is what kind of wave
transverse
what is light special
However, it is special as it does not need a medium to travel through.
what is a vacuum
something with no particles
what can light travel through
a vacuum
what is the speed of light in a vacuum
The speed of light in a vacuum is about 300milllion metres per second!
what can we think of a light wave as
We can think of a light wave as a RAY OF LIGHT travelling in a STRAIGHT LINE.
what do we often draw a light ray as
a straight line
what can light not go behind?
Light cannot go around corners, so if light hits an object, it is unable to light up the area behind an object: This is called a SHADOW!
what is a light source
These are objects which produce their own light.
examples of light sources
Eg. light bulb, the Sun, phone screen.
why is a light soure important?
You need a light-source to be able to see an object.
what does the light do
The light from the source hits the object, bounces off it (REFLECTS) and goes into your eye:
