colour Flashcards
what is a spectrum
the colours formed when a beam of white light is dispersed
why does dispersion happen
because the different colours of light are refracted by different amounts
first scientist to correctly explain the cause of a rainbow
Al-Farish
what causes the colours of light to be refracted by different amounts
because all colours of light have different wavelenghts and frequencies. higher frequencies reflect more that lower frequencies
what does laser stand for
Light Amplified by the Simulated Emission of Radiation
How many colours of light do lasers produce
one
what kind of light are lasers
monochromatic
who first built a laser
Theodore Maiman
when was the first laser built
1960
who first created gas lasers
Ali Javan ( and 2 others)
what gases do gas lasers contain
helium and neon
what did Theodore Maiman use for his lasers
a ruby crystal
how are lasers used for discs and CDs
A laser makes a series of pits on the surface of a disc that codes for the data on the disc, the surface is then coated with a thin layer of metal. When the disc is put into a machine, low-power lasers bounces light off the surface of the disc and reads the series of pits to reproduce data.
what are light sensitive cells called
cones
what is the ratio of people who colour blind
1 in 20 (usually men)
