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BHU PMT BHU PMT (Screening) Solved Paper-2005

  • question_answer
    A plane glass slab is kept over various colour letters, the letter which appears least raised is:

    A)  red                                       

    B)  violet

    C)  green                                  

    D)  blue

    Correct Answer: A

    Solution :

                      Key Idea: Maximum apparent depth means minimum raised from surface. We know that \[\mu =\frac{Real\text{ }depth}{Apparent\text{ }depth}\] Red colour has minimum value of refractive index and thus maximum value of apparent depth. Hence, it should be raised least.


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