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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    A glass slab of thickness 4 cm contains the same number of waves as 5 cm of water column- When both are transmersed by the same monochromatic light. If the refractive index of water is 4/3, what is that of glass:

    A)  5/3                       

    B)         5/4                       

    C)  16/15                   

    D)         1/5

    Correct Answer: A

    Solution :

    Wave number \[=nt\]                           \[\therefore \]                  \[{{n}_{1}}{{t}_{1}}={{n}_{2}}{{t}_{2}}\]                 \[{{n}_{1}}\times 4=4/3\times 5\] \[\therefore \]  \[{{n}_{1}}=5/3\]


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