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Chapter 35: Q.14 (page 1017)
A magnifier has a magnification of . How far from the lens should an object be held so that its image is seen at the near-point distance of ? Assume that your is immediately behind the lens.
far from the lens should an object be held so that its image is seen at the near-point distance of .
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A friend lends you the eyepiece of his microscope to use on your own microscope. He claims the spatial resolution of your microscope will be halved, since his eyepiece has the same diameter as yours but twice the magnification. Is his claim valid? Explain.
| Marooned on a desert island and with a lot of time on your hands, you decide to disassemble your glasses to make a crude telescope with which you can scan the horizon for rescuers. Luckily you’re farsighted, and, like most people, your two eyes have different lens prescriptions. Your left eye uses a lens of power +4.5 D, and your right eye’s lens is +3.0 D. a. Which lens should you use for the objective and which for the eyepiece? Explain.
b. What will be the magnification of your telescope?
c. How far apart should the two lenses be when you focus on distant objects?
A -focal-length converging lens is to the right of a -focal-length converging lens. A -tall object is distance L to the left of the first lens.
a. For what value of L is the final image of this two-lens system halfway between the two lenses?
b. What are the height and orientation of the final image?
In figure , parallel rays from the left are focused to a point at two locations on the optical axis. find the position of each location, giving your answer as a distance left or right of the lens.
A camera takes a properly exposed photo with a diameter aperture and a shutter speed of . What is the appropriate aperture diameter for a shutter speed?
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