NEET Sample Paper NEET Sample Test Paper-51

  • question_answer 14) Consider slabs of three media A, B and C arranged as shown in figure. R.I of A is 1.5 and that of C is 1.4. If the number of waves in A is equal to the number of waves in the combination B and C then refractive index of B is-  

    A) 1.4                               

    B) 1.5

    C) 1.6                   

    D) 1.7

    Correct Answer: D

    Solution :

    \[{{n}_{A}}={{n}_{B}}+{{n}_{C}}\] \[{{\mu }_{A}}{{d}_{A}}\,=\,{{\mu }_{B}}{{d}_{B}}+{{\mu }_{C}}{{d}_{C}}\] \[1.5\,(3x)=(x)\,\,+\,\,1.4\,(2x)\] \[4.5\,\,=\,\,{{\mu }_{B}}\,\,+\,\,2.8\] \[{{\mu }_{B}}=4.5-2.8\text{ }=1.7\]

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