25_Chapter 25 HomeworkCH25 Optical Instruments

# 25_Chapter 25 HomeworkCH25 Optical Instruments - Optical...

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

Optical Instruments 361 From the thin lens equation, the image distance of the objective lens in this case is () ( ) 11 1 300 cm 20.0 cm 21.4 cm 300 cm 20.0 cm pf q == = −− 2.00 cm e f With an eyepiece of focal length = , the angular magnification for this telescope is 1 21.4 cm 10.7 2.00 cm e q m f = 25.56 We use 122 nnnn 1 p qR += , with p → ∞ and q equal to the cornea to retina distance. Then, 21 2 1.3 2.00 cm 0.507 cm 5.07 mm nn Rq n  = =   4 1.00 1.34 25.57 When a converging lens forms a real image of a very distant object, the image distance equals the focal length of the lens. Thus, if the scout started a fire by focusing sunlight on kindling 5.00 cm from the lens, 5.00 cm fq = = . (a) When the lens is used as a simple magnifier, maximum magnification is produced when the upright, virtual image is formed at the near point of the eye (
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online