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8/13/2019 9 Vision Phys
1/6
Lecture: Physiology of Vision
I. Overview of Light and Optics
A. Wavelength and Colors of Visible Radiation
1. electroagnetic radiation
gaa ra!s "#ra!s $V light VISIBLE LIGHT Infrared Radio Wave
short ediu long%1'n( %)*+'& n( %1&,n(
,. wave#photon dualit! # light travels in wave#li-e fashion with single pac-etsof energ! called photons
). visible spectru # different colors of light have different wavelengths
Violet /lue 0reen ellow Orange Red
)*&n 2*&n ''&n 3)&n 3*&n +)&n
2. color of an ob4ect # the color of an ob4ect is deterined b! which
wavelengths are R56L5C758 bac- to the retina %not absorbed b! the ob4ect(
a. white # all wavelengths reflected b! ob4ect
b. blac- # all wavelengths absorbed b! ob4ect
/. Refraction of Light and Conve9 Lenses
1. light refraction # light will bend when it passes fro one ediu %air(into another %lens( e.g. pencil in glass of water
,. conve9 lens # %thic-er at center tapered at edge( causes light to bend sothat it coes together at a focal point
a. real iage # iage at focal point of conve9 lens ###; inverted