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Speed of light in certain medium

  1. Oct 20, 2009 #1
    1. The problem statement, all variables and given/known data
    Light travels at different speed through different materials. If it travels at speed c1 in a medium of refractive index 1.2, what is its speed in a medium of refractive index 1.6

    a. 1.3 c1
    b. 0.67 c1
    c. 2 c1
    d. 1.7 c1
    e. 0.55 c1

    2. Relevant equations
    [tex]n=\frac{c}{v}[/tex]


    3. The attempt at a solution
    n1 v1 = n2 v2

    v2 = v1 * n1/n2 = 1.2/1.6 * c1 = 0.75 c1 ??
     
  2. jcsd
  3. Oct 20, 2009 #2

    rl.bhat

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    Homework Helper

    Your answer is correct, but there is no choice!
    Check the question. Whether the light is entering from air to medium in both the case?
     
  4. Oct 20, 2009 #3
    Hi Mr. rl.bhat

    That's all the question. Thanks a lot for your help :smile:
     
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