This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Lecture 12 9.1. The human eye Unaided Eyeglasses Color perception 9.1 The Human eye • Seeing is probably the sense we have • Even from the engineering point of view the eye is an amazing instrument • Parts of the human eye • Imaging of the human eye Meniscus convex lens The human eye as an optical system A.S GRIN lens n=1.376 n=1.0 n=1.336 n=1.337 n=1.406...1.386 Accommodation • Relaxed muscle: We focus on inFnity • Strained muscle: We focus on something closer by. ¡or most people 25cm is still rather comfortable Why don’t we see well underwater ? Dioptric Power Convenient quantity because it is additive (for thin lenses in contact) In physiological optics lenses are characterized in terms of their dioptric power (unit diopter, 1/m) Consider double convex lens = + We can also deFne the dioptric power for each interface Nearsightedness ¡or a relaxed muscle A point in inFnity is focused in front of the retina The far point is not at inFnity How do we correct for that: •...
View Full Document
This note was uploaded on 08/06/2008 for the course PHYS 352 taught by Professor Dierolf during the Fall '04 term at Lehigh University .
- Fall '04