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Chapter 35: Q.1 (page 1016)
Suppose a camera鈥檚 exposure is correct when the lens has a focal length of 8.0 mm. Will the picture be overexposed, underexposed, or still correct if the focal length is 鈥渮oomed鈥� to 16.0 mm without changing the diameter of the lens aperture? Explain
Picture is underexposed
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White light is incident onto a prism at the shown in Figure . Violet light emerges perpendicular to the rear face of the prism. The index of refraction of violet light in this glass is larger than the index of refraction of red light. At what does red light emerges from the rear face?
| 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鈥檙e 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鈥檚 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 telescope has a diameter objective lens. What minimum diameter must the eyepiece lens have to collect all the light rays from an on-axis distant source?
A red card is illuminated by red light. What color will the card appear? What if it鈥檚 illuminated by blue light?
The rays leaving the two-component optical system of FIGUREPproduce two distinct images of the-tall object. what are the position (relative to the lens), orientation, and height of each image?
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