I HATE LIGHT
pinhole imaging
light travels in a straight line
features
inverted
when distance: light screen & light source == fixed. smaller the distance, larger the image
nothing to do with the shape
CAMERA
basics of light
it's LUMINOUS
way of transferring energy
send light waves
light: transverse, 30000000m/s, travel in liquid and gas and vacuum
sound: longitudinal, 330m/s, travel in matter
types
ray (one straight)
parallel beam (many straight)
divergent (scatter)
convergent (combine)
transparent: all pass
transluscent: some
opaque: none pass
EG: camera