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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2008

  • question_answer
    A fish in water (refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is

    A)  \[x+y\left( 1-\frac{1}{n} \right)\]

    B)  \[x+ny\]

    C)  \[x+y\left( 1+\frac{1}{n} \right)\]

    D)  \[y+x\left( 1-\frac{1}{n} \right)\]

    Correct Answer: B

    Solution :

    When object is in rarer medium and observer is in denser medium Normal shift,   \[d=(n-1)h\] where h = real depth Here,             h = y Now, apparent depth or the apparent height of the bird from the surface of the water \[=y+(n-1)y=ny.\] The total distance of the bird as estimated by fish is x + ny.


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