Physics Y9 Light Flashcards
what colours does a white object reflect/absorb
reflects: r g b absorbs: -
what colours does a black object reflect/absorb
reflects: - absorbs: r g b
what colours does a blue object reflect/absorb
reflects: b absorbs: r g
what colours does a red object reflect/absorb
reflects: r absorbs: g b
what colours does a green object reflect/absorb
reflects: g absorbs: r b
what colours does a magenta object reflect/absorb
reflects: r b absorbs: g
what colours does a yellow object reflect/absorb
reflects: r g absorbs: b
what colours does a cyan object reflect/absorb
reflects: b g absorbs: r
what is light
the portion of the electromagnetic spectrum which is visible
what portion of the electromagnetic spectrum does visible light cover
400-700nm
how are waves of energy transmitted
electromagnetic radiation
how does light travel
in straight lines
which parts of the eye refract light
cornea and lens
which part of the eye is sensitive to light
retina
which part of the eye carries electrical impulses to the brain
optic nerve
how does a mirror work
light reflects off of an object, then off of the mirror and into your eyes, all in straight lines
what is the normal
an imaginary line 90° to a mirror or a place of refraction
what is the ray that goes into the mirror called
incident ray
what is the ray that comes out from the mirror called
reflection ray
what is the angle in between the incident ray and the normal
angle of incidence
what is the angle in between the reflection ray and the normal
angle of reflection
angle of incidence (</>/=) angle of reflection
=
what is the law of reflection
angle of incidence = angle of reflection
is a virtual image real
no
what is specular reflection
reflection from a smooth surface
what is diffuse reflection
reflection from a rough surface
can an image be seen in specular reflection
yes
can an image be seen in diffuse reflection
no
what colour is the least reflective
black
what colour is the most reflective
white
can light bend
no
can light change direction
yes
what is the angle in between the ray of refraction and the normal
angle of refraction
if light travels from a more to less dense medium angle of incidence (</>/=) angle of refraction
<
if light travels from a less to more dense medium angle of incidence (</>/=) angle of refraction
>
why does light refract
it changes speed
what happens when white light refracts through a prism
a spectrum is created
what are the traditional colours of the rainbow in order
red (orange) yellow green blue (indigo) violet
which colour has the longest wavelength
red
which colour has the shortest wavelength
violet
what is dispersion
the seperation of light by wavelength
why is green green
because the human brain perceives it as green
what does a colour filter do
absorbs certain wavelengths and transmits others
