College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 25, Problem 38P
An elderly sailor is shipwrecked on a desert Island, but manages to save his eyeglasses. The lens for one eye has a power of +1.20 diopters, and the other lens has a power of +9.00 diopters. (a) What is the magnifying power of the telescope he can construct with these lenses? (b) How far apart are the lenses when the telescope is adjusted for minimum eyestrain?
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An elderly sailor is shipwrecked on a desert island, but manages to save his eyeglasses. The lens for one eye has a power of +1.20 diopters, and the other lens has a power of +9.00 diopters. (a) What is the magnifying power of the telescope he can construct with these lenses? (b) How far apart are the lenses when the telescope is adjusted for minimum eyestrain?
A small telescope has a concave mirror with a 5.50-m radius of curvature for its objective. Its eyepiece is a 3.60-cm focal length lens.
(a) What is the telescope's angular magnification?
(b) What is the angle subtended by a 25,000-km diameter sunspot? The average Earth-Sun distance is 1.496 x 10¹1 m.
rad
(c) What is the angle of its telescopic image?
rad
The lens-to-retina distance of a woman is 2.04 cm, and the relaxed power of her eye is 53.8 D.
(a) What is her far point?How is the refracting power of a person's eye for distant vision related to their far point and lens-to-retina distance? m(b) What eyeglass power will allow her to see distant objects clearly, if her glasses are 1.80 cm from her eyes?D
Chapter 25 Solutions
College Physics
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- What is the angular magnification of a telescope that has a 100 cm-focal length objective and a 2.50 cm-focal length eyepiece?arrow_forwardA good quality camera “lens” is actually a system of lenses, rather than a single lens, but a side effect is that a reflection from the surface of one lens can bounce around many times within the system, creating artifacts in the photograph. To counteract this problem, one of the lenses in such a system is coated with a thin layer of material (n=1.28) on one side. The index of refraction of the lens glass is 1.68. What is the smallest thickness of the coating that reduces the reflection at 640 nm by destructive interference? (In other words, the coating’s effect is to be optimized for =640 nm .)arrow_forwardTwo stars that are 109km apart are viewed by a telescope and found to be separated by an angle of 105 radians. If the eyepiece of the telescope has a focal length of 1.5 cm and the objective has a focal length of 3 meters, how far away are the stars from the observer?arrow_forward
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