seb
there are 2 different types of lenses, what are they?
convex and concave
what focuses light when entering the eye?
lens
what is the transparent outer part of your eye
cornea
what changes size to adjust the amount of light?
pupil
what is the muscle that controls the size of the pupil?
iris
what sends electrical impulsesfrom eye to the brain?
optic nerve
what is the photosensitive layer at the back of the eye?
retina
what is the hard structure forming the outside of the eye?
sclera
give a definition of a luminous object
objects that give out light
give a definition of a non luminous object
objects that dont give out light
how is sound formed?
sound comes from vibration
give an example on how sound can be made
a guitar being plucked
what is frequency?
the number of waves each second
how is frequency mesured
frequency is mesured in hertz (hz)
complete the sentence the bigger the amplitude the
louder the sound
complete the sentence the smaller the amplitude the
quieter the sound
what are the primary colours of light?
red, green, blue
what are the secondary colours of light?
magenta, cyan, yellow
what are the 2 different types of circuits
series and parralel
how do you calculate resistance?
resistance=potential difference/current
what is static electricity?
static is a build up of electrical charge
how does static electricty occur?
electrons are transfired fro one material to another