p35_044 - medium-range) sources, but not from close ones....

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
44. (a) A parallel ray of light focuses at the focal point behind the lens. In the case of farsightedness we need to bring the focal point closer. That is, we need to reduce the focal length. From problem 29, we know that we need to use a converging lens of certain focal length f 1 > 0 which, when combined with the eye of focal length f 2 ,g ives f = f 1 f 2 / ( f 1 + f 2 ) <f 2 . Similarly, we see that in the case of nearsightness we need to do a similar computation but with a diverging ( f 1 < 0) lens.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: medium-range) sources, but not from close ones. The person (not wearing glasses) is able to see far (not near), so the person is farsighted. (c) The bifocal glasses can provide suitable corrections for dierent types of visual defects that prove a hindrance in dierent situations, such as reading (dicult for the farsighted individual) and viewing a distant object (dicult for a nearsighted individual)....
View Full Document

This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

Ask a homework question - tutors are online