Physical Science
when distance is nevative the image is... (type)
the image is virtual
when magnification is negative, the image is... (orientation)
the image is inverted
converging (convex lens and concave mirrors) have a _____ fical length
positive focal length
diverging (convex mirror and concave lens) have a ______ focal length
negative focal length
what are fibre optics
long glass fibre "wires" that lasers are shot down which reflect off the inside of the strands (TIR)
what do fibre optics do
they transmit data by flashing the lasers on and off, whixh transmit most of the information on the internet
optic nerve
bundle of nerve fibres on back of eye that transmit nerve pulses to brain that creates and image with it
retina
"carpet" of nerve cells at back of eye, converts light to nerve impulses (colour)
what are rods and cones
rods: sensitive to low light, can only see shades of grey
cones: three types, see colour
lens of eye
converging lens, focus real image on retina (the brain flips it) changes shape to focus on objects at different distances (variable focal length) loss of flexibility cause eye conditions
iris
controls amount of light entering the eye by changing the size of the pupil