COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 86QAP
To determine
The focal length of the eyepiece lens
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A friend lends you the eyepiece of his microscope to use on your own microscope. He claims that since his eyepiece has the same diameter as yours but twice the focal length, the resolving power of your microscope will be doubled. Is his claim valid? Explain.
If a lens is immersed in water, its focallength changes, as discussed in Conceptual Example 26-17.(a) If a spherical mirror is immersed in water, does its focal lengthincrease, decrease, or stay the same? (b) Choose the best explanation from among the following:I. The focal length will increase because the water will causemore bending of light.II. Water will refract the light. This, combined with the reflection due to the mirror, will result in a decreased focal length.III. The focal length stays the same because it depends on thefact that the angle of incidence is equal to the angle of reflection for a mirror. This is unaffected by the presence of thewater
Example 23-9 : Image formed by a converging lens. What are (a) the position, and (b) the size, of the image of a 7.6-cm-high leaf placed 1.00 m from a +50.0-mm-focal-length camera lens?
Chapter 24 Solutions
COLLEGE PHYSICS
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- During LASIK eye surgery (laser-assisted in situ keratomileusis), the shape of the cornea is modified by vaporizing some of its material. If the surgery is performed to correct for nearsightedness, how does the cornea need to be reshaped?arrow_forwardCan an image be larger than the object even though its magnification is negative? Explain.arrow_forwardA laboratory (astronomical) telescope is used to view a scale that is 300 cm from the objective, which has a focal length of 20.0 cm; the eyepiece has a focal length of 2.00 cm. Calculate the angular magnification when the telescope is adjusted for minimum eyestrain. Note: The object is not at infinity, so the simple expression m = fo/fe is not sufficiently accurate for this problem. Also, assume small angles, so that tan = .arrow_forward
- A laboratory (astronomical) telescope is used to view a scale that is 300 cm from the objective, which has a focal length of 20.0 cm; the eyepiece has a focal length of 2.00 cm. Calculate the angular magnification when the telescope is adjusted for minimum eyestrain. Note: The object is not at infinity, so the simple expression m = fo/fe is not sufficiently accurate for this problem. Also, assume small angles, so that tan = .arrow_forwardWill the focal length of a lens change when it is submerged in water? Explain.arrow_forwardThe accommodation limits for Nearsighted Nicks eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he is able to see faraway objects clearly. At what minimum distance is he able to see objects clearly?arrow_forward
- In Example 25.7, the magnification of a book held 7.50 cm from a 10.0 cm focal length lens was found to be 3.00. (a) Find the magnification for the book when it is held 8.50 cm from the magnifier. (b) Do the same for when it is held 9.50 cm from the magnifier. (c) Comment on the trend in m as the object distance increases as in these two calculations.arrow_forwardWhat is the focal length of a makeup mirror that produces a magnification of 1.50 when a person’s face is 12.0 cm away? Explicitly show how you follow the steps in the ProblemSolving Strategy for Mirrors.arrow_forwardA clerk at the local grocery store wears glasses that make her eyes look smaller than they actually are. Is the clerk nearsighted or farsighted? Explain.arrow_forward
- A lens can be used to start a fire by focusing an image of the sun onto a piece of flammable material. All other things being equal, would a lens with a short focal length or a long focal length be better as a fire starter? Explain.arrow_forwardExplain why an object in water always appears to be at a depth shallower than it actually is? Why do people sometimes sustain neck and spinal injuries when diving into unfamiliar ponds or waters?arrow_forwardWhere must the film be placed if a camera lens is to make asharp image of an object far away? Explain.arrow_forward
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