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Year 8
SCIENCE
light
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Cards (23)
Light travels
1. From
luminous objects
2. To
non luminous objects
3. In a
straight line
4.
Reflects back
to the eyes
Transparent
Allows
light through
, you can
see through
(e.g. window glass)
Translucent
Allows some light through but it is scattered, makes object blurry to see through (e.g. tracing paper)
Opaque
Doesn't allow any light through, you can't see through (e.g. book)
Incident
ray
The ray of
light
hitting the
glass
Angle of incidence
The
angle
between the incident ray and the normal
Refracted ray
The
light exiting
the
glass
White light is made up of the 7 colours on the spectrum
The 7 colours of the spectrum
red
orange
yellow
green
blue
indigo
violet
red light travels faster in glass than blue light
Light can be
split
using a
prism
A
blue
light shining through a
red
filter will give no light
Black isn't a
colour.
Its
absence
of light.
Dispersion
The splitting up of white light inte its component
colours
All colours travel at the same speed in a
vaccum
(
3x10
m/s)
White
isn't a colour but a mixture of all the colours of the
rainbow.
Filters absorb some colours of
white light
and lets other colours through to create
coloured light
a
red
filter absorbs all colours except
red
light
a
blue
filter absorbs all colours apart from
blue
light
a
green filter
absorbs all colours except a
green
light. it is used to separate out the green light from the red and blue light
a magenta filter absorbs all colours apart from
red
and
blue
a cyan filter absorbs all colours except
green
and
blur
a
yellow
filter absorbs all colours except from red and
green