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True/False Help: Index of refraction and Reference Frames

  1. Mar 27, 2008 #1
    Which of the following statements are true?
    1. The index of refraction is the ratio of the vacuum speed of light to the speed inside the medium.
    2. The index of refraction is independent of the wavelength of the light.
    3. If a light beam is incident perpendicular to the surface of another medium, it is not refracted.
    4. The index of refraction of the vacuum is zero.

    AND

    Which of the following statements are true?
    1. Within a certain reference frame, two objects are each traveling with almost the speed of light, in opposite directions, and toward each other. Within that frame, their relative velocity is also almost the speed of light.
    2. All three velocities in the formula for relativistic velocity addition are measured within the same reference frame.
    3. If any one of the two velocities in the formula for relativistic velocity addition is c, the result is always c.
    4. A spaceship is approaching a star with 0.4c. Seen from within the spaceship, the light from the star is moving with 1.4c.
    5. Within a certain reference frame, two objects are reach traveling with 0.1c, in opposite directions, and toward each other. The observed speed with which they approach is approximately the same as would be seen from one of the objects.
     
  2. jcsd
  3. Mar 27, 2008 #2

    Claude Bile

    User Avatar
    Science Advisor

    What do you think the answers are?

    What is your reasoning?

    You need to show us your working before we can help you out as per the forum rules.

    Claude.
     
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