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2014-10-15T19:18:42+05:30

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A Concave mirror can be used in car head lights

1) So u = c/v where c = speed of light in vacum and v = speed of light in substance

1.31 = 3 x 10⁸/v
v = 2.29 x 10⁸ m/s

2) 1.83 = 3 x 10⁸/v
  v = 1.64 x 10⁸ m/s
2 3 2
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2014-10-15T21:45:47+05:30

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The mirror used in a car headlight is the Concave spherical mirror. The reason is that:  the bulb is placed nearly at the focus of the concave mirror.  The light rays get reflected parallel to the axis of the mirror.   Now the headlight is inclined at a small angle to the road and so they fall on the road at a long distance from the car like 30 to 40 meters.

The language in the question is not clear.. But I assume the following: 

I assume that the values given are the refractive indices of the media.
         μ = 1.31    for ice.
    μ = speed of light in vacuum / speed of light in the medium
       speed of light in ice = (3 * 10⁸ m/s)  / 1.31 = 2.29 * 10⁸ meters/sec

2) carbon di-sulfide has a refractive index = 1.83

      speed of light in Carbon di-sulfide = 3 * 10⁸ / 1.83 = 1.639 * 10⁸ m/sec


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