science
Grade-7
Easy

Question

The refractive index of glass, given the speed of light in the glass, is 2 x 108 m/s is ___.

  1. 1
  2. 1.5
  3. 1.33
  4. 0

hintHint:

Use formula of refractive index.

The correct answer is: 1.5


    The correct answer is b) 1.5. 
    Refractive index is the ratio of speed of light in vacuum and speed of light in medium.
    Here the speed of light in glass is given as 2 x 10m/s.
    Speed of light in vacuum=3x108 m/s.
    Now, Refractive index = 3x10/2 x 108
    =1.5

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