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8th Class Science Light Question Bank Light Formative Objective Problems

  • question_answer
    The velocity of light in air is \[3\times {{10}^{8}}m{{s}^{-1}}\] and in glass is \[2\times 108m{{s}^{-1}}\].. The refractive index of glass w.r.t air is

    A)  2/3       

    B)  3/2   

    C)  4/3                       

    D)  9/4

    Correct Answer: A

    Solution :

      \[{{V}_{a}}=3\times {{10}^{8}}m{{s}^{-1}}.....{{V}_{g}}=2\times {{10}^{8}}m{{s}^{-1}}\] \[_{a}{{\mu }^{g}}=\frac{{{V}_{g}}}{{{V}_{a}}}=\frac{2\times {{10}^{8}}}{3\times {{10}^{8}}}=\frac{2}{3}\]            


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