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Chapter 25: Geometric Optics

College Physics (Urone)
Pages: 891 - 932

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96 Questions for Chapter 25: Geometric Optics

  1. A ring with a colorless gemstone is dropped into water. The gemstone becomes invisible when submerged. Can it be a diamond? Explain.

    Found on Page 927
  2. A scuba diver training in a pool looks at his instructor as shown in Figure 25.53. What angle does the ray from the instructor’s face make with the perpendicular to the water at the point where the ray enters? The angle between the ray in the water and the perpendicular to the water is 25.0°.

    Found on Page 929
  3. A high-quality diamond may be quite clear and colourless, transmitting all visible wavelengths with little absorption. Explain how it can sparkle with flashes of brilliant colour when illuminated by white light

    Found on Page 927
  4. Components of some computers communicate with each other through optical fibers having an index of refraction n=1.55.What time in nanoseconds is required for a signal to travel 0.200 mthrough such a fibre?

    Found on Page 929
  5. Is it possible that total internal reflection plays a role in rainbows? Explain in terms of indices of refraction and angles, perhaps referring to Figure 25.48. Some of us have seen the formation of a double rainbow. Is it physically possible to observe a triple rainbow?

    Found on Page 927
  6. (a) Using information in Figure \(25.23\), find the height of the instructor’s head above the water, noting that you will first have to calculate the angle of incidence. (b) Find the apparent depth of the diver’s head below water as seen by the instructor.

    Found on Page 929
  7. The most common type of mirage is an illusion that light from faraway objects is reflected by a pool of water that is not really there. Mirages are generally observed in deserts, when there is a hot layer of air near the ground. Given that the refractive index of air is lower for air at higher temperatures, explain how mirages can be formed.

    Found on Page 927
  8. Suppose you have an unknown clear substance immersed in water, and you wish to identify it by finding its index of refraction. You arrange to have a beam of light enter it at an angle of 45.0°, and you observe the angle of refraction to be40.3°. What is the index of refraction of the substance and its likely identity?

    Found on Page 930
  9. It can be argued that a flat piece of glass, such as in a window, is like a lens with an infinite focal length. If so, where does it form an image? That is, how aredianddorelated?

    Found on Page 927
  10. On the Moon’s surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected. The distance to the Moon is calculated from the round-trip time. What percent correction is needed to account for the delay in time due to the slowing of light in Earth’s atmosphere? Assume the distance to the Moon is precisely3.84×108m, and Earth’s atmosphere (which varies in density with altitude) is equivalent to a layer 30.0 kmthick with a constant index of refraction n=1.000293.

    Found on Page 930

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