Light Flashcards
what is light
it is a form of energy
what type of energy can light energy be converted to
it can be converted to electrical energy in a solar sell
It can be converted into chemical in plants when they carry out photosynthesis
what is the source of light
SUN
what is the speed of light
300,000,000 metres in one second
what is shadow
it is formed when the path of the light is blocked and cant pass through he material
what is a luminous object
they give out their own light example-sun
what is an non-luminous object
they reflect lights from their surface
describe reflection of light
light reflects on almost all objects. when you look at a reflected image it is an inverted image. the left side is in the right and the right side is on the left
what is despersion
it is the separation of the light into its different colours called a spectrum
how many colours make up white light
7
in what order do the different light colours appear
red orange yellow green blue indigo violet
what is refraction
it is the bending of light from one end to another
what is a medium
it can be water,air or glass
describe the refraction of light passing from air into glass back into air
as light passes from air into glass it bends
as light passes from glass back into air it bends again
NOTE
the same time it enters it leaves
