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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2006

  • question_answer
    A transparent cube of 15 cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6 cm and when viewed through the opposite face is 4 cm. Then the refractive index of the material of the cube is :

    A)  2.0                                        

    B)         2.5

    C)         1.6                                        

    D)         1.5

    Correct Answer: D

    Solution :

    Let real depth of the bubble from one side is\[x\]. Then                 \[\mu =\frac{x}{6}=\frac{15-x}{4}\] \[\therefore \]  \[x=9\,\,cm\] Hence,  \[\mu =\frac{x}{6}=\frac{9}{6}=1.5\]


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