COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 24, Problem 76QAP
To determine
The overall magnification of the compound microscope.
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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.
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.
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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_forwardWill the focal length of a lens change when it is submerged in water? Explain.arrow_forwardA cataract-impaired lens in an eye may be surgically removed and replaced by a manufactured lens. The focal length required for the new lens is determined by the lens-lo-retina distance, which is measured by a sonar-like device, and by the requirement that the implant provide for correct distance vision. (a) If the distance from lens to retina is 22.4 mm, calculate the power of the implanted lens in diopters. (b) Since there is no accommodation and the implant allows for correct distance vision, a corrective lens for close work or reading must be used. Assume a reading distance of 33.0 cm, and calculate the power of the lens in the reading glasses.arrow_forward
- A student makes a microscope using an objective lens and an eyepiece. If she moves the lenses closer together, does the microscope’s magnification increase or decrease? Explain.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_forwardUnreasonable Results A boy has a near point of 50 cm and a far point of 500 cm. Will a —4.00 D lens correct his far point to infinity?arrow_forward
- The 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_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_forwardThe distance between the lenses in a compound microscope is 18 cm.The focal length of the objective is 1.5 cm. If the microscope is to providean angular magnification of -83 when used by a person with a normalnear point (25 cm from the eye), what must be the focal length of theeyepiece?arrow_forward
- An object at the distance do = 15 cm from a lens produces an inverted image. Is thefocal length of the lens greater than, less than, or equal to 15 cm? Explain.arrow_forwardPhotographers who are attempting to capture a large gathering of people will step away from the group and then refocus their lenses. Is the camera lens moved closer or further away from the sensor when the camera moves? Explain.arrow_forwardIf 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 thewaterarrow_forward
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