BCS 110 Lecture 9: BCS EXAM 2 material
18 Jan 2018
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Document Summary
Light can be thought of in two different ways: particles of energy (photons, waves. Visible light (for humans) is waves of electromagnetic energy between 380-760nm. Light is changed by objects it encounters in its path: reflected; refracted (bent); diffracted and absorbed. There is one-to-one correspondence between a point in space and a place on the retina. Iris: donut-shaped bands of contractile tissue that give the eye its color. Light enters the eye through the pupil, the hole in the iris. The pupil changes size in response to changes in illumination: sensitivity, acuity. Ciliary muscles alter the shape of the lens as needed. Accommodation: the process of adjusting the lens. Two eyes: field-of-view, binocular vision (depth) Convergence: eyes must turn slightly inward with viewing objects. Binocular disparity: the difference in the position of the same image on the two retinas. Converts light to neural signals (cid:862)i(cid:374)side-out(cid:863): light passes through se(cid:448)eral (cid:272)ell la(cid:455)ers (cid:271)efore rea(cid:272)hi(cid:374)g its re(cid:272)eptors.
