Light production

Cornea

direct light

Iris

control size of pupil

lens

direct light to rectina

pupil

control amount of light entering the eye

optic nerve

sends info to the brain

vitreous humor

maintains shape of the eye

retina

vision cones: see color rod: see contrats

cones

see color

rod

see contrast

light

• form of electromagnetic wave or packer if energy (photon)

• wavelength of 400-700nm visible to the human eye

• travels in straight lines as a wave or photon

• electromagnetic wave (electric + magnetic field)

• travels at the speed of light of 3.00 × 10(to the exponent of 8)

electromagnetic spectrum

• diagram that illustrates the range of electromagnetic waves in order of wavelength/frequency

• the type of electromagnetic wave is determined by amount of energy carried in these photons

• travels through a vacuum at a speed of 3.00 × 10 (to the exponent of 8 ) m/s

Incandescence

production of light through heat

examples

• incandescent light

• ineffiecent

• energy lost as heat

Electric discharge

production of light through vaccumn and inert gas

examples

• neon light (neon or agron gas producing different colors)