unit 7 - rays and waves Flashcards
what kind of waves are light
transverse wave
what is the speed of the light
3.0*10^8
characteristic of the image when the image is reflected on the mirror
upright same size the image is as far behind the mirror as the object laterally inverted virtual
difference between the virtual and real image
the real image is an image formed when the light rays actually meet, so you can see it on the screen.
the formula for refractive index
speed of light in vacuum/ speed of light in the medium
what the effect called when the white light comes out a range of colours
dispersion
what is a critical angle
when the incident is at the critical angle the refracted ray is only on the surface
when does total internal reflection happen
when the incident angle is bigger than the critical angle
use of optical fibres
carry telephone calls
what is snell’s law
sin i / sin r = refractive index
the formula for calculating the critical angle
sin c = 1/n
what are the 3 standard rays in the ray diagram
going through centre
parallel to the axis then go through F after meeting the lens
go through F’ then parallel to the axis after meeting the lens
type of position in ray diagram
beyond 2F - real, inverted, diminished
at 2F - real, inverted, same size
between 2F and F - real, inverted, enlarged
between F and lens - virtual, up straight, enlarged
name the electromagnetic spectrum
Roman ( radio waves ) Men ( microwaves ) Invented ( infrared ) Very ( Visible ) Unusual ( Ultraviolet ) X-ray ( X-ray ) Guns ( gamma )
as you go down FREQUENCY increases
as you go down WAVELENGTH decreases
feature of the electromagnetic spectrum
all travel at the speed of light
all transverse waves
they transfer energy
they can travel at vacuum
