PHYS 102 Lecture Notes - Lecture 28: Vitreous Body, Aqueous Humour, Optical Instrument

• School: McGill University
• Department: Physics
• Course: PHYS 102
• Professor: Nikolaos Provatas

Document Summary

This will not be on the final, but chapter 23 will be on the final. The human eye as an optical instrument. Front surface is the cornea, where refraction occurs. The iris controls the intensity of the light entering. The lens has variable geometry to adjust for object position. The vitreous humor is a gel like substance that fills the interior of the eye. The retina contains several rod and cone cells, and has the greatest sensitivity to light. Why would there not be much refraction between the aqueous humor and lens, and the lens and vitreous humor. Because indices of refraction and humors and lens are similar. Index of refraction of the lens is 1. 39-1. 41, while the humor is n=1. 34. This small difference means that there"s little refraction at humor/lens surfaces. The cornea has n=1. 38, while air is n=1. This means that most of the refraction happens at air/cornea interface. The lens acts only for fine adjustment.