light Flashcards
luminos objects produce?
light
light is a wave whic always travels in a?
straight line
what kind of waves are light waves?
they are transverse waves: they have undulations
water waves travel by…
moving particles
do light waves need particles to travel?
no for example when light travels through space
do light waves always travel at the same speed as a vacuum
light waves always travel at the same speed as a vacuum but there slowed down by particles
the speed of light in a vacuum is
300000000 three hundred million metres per second
how long does it take for light waves to travel from the sun to the earth?
8.3 minutes
what is reflection?
reflection is when a wave hits the surface
rough surfaces look dull because…
because the light is reflected in lots of diffrent directions
angle of incidence(i) =
=angle of reflection
when light goes from a LESS DENSE medium to a MORE DENSE MEDIUM
light bends towards the normal (e.g air to glass)
When light hits glass at an angle…
it slows down and bends
what does a lens do?
a lens refracts(bends) light
a convex lens bulges outwards and makes rays of light…
converge (move together)
