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NEET AIPMT SOLVED PAPER 2000

  • question_answer
                    A transparent cube contains a small air bubble. Its apparent distance is 2 cm when seen through one face and 5 cm when seen through other face. If the refractive index of the material of the cube is 1.5, the real length of the edge of cube must be:                                                                                                      

    A)                 7 cm                      

    B)                 7.5 cm  

    C)                 10.5 cm 

    D)                 \[\frac{14}{3}\]cm

    Correct Answer: C

    Solution :

                    Refractive index \[(\mu )=\frac{\operatorname{Re}al\,depth}{Apparent\,depth}\]                 Refractive index (\[\mu \]) = 1.5                 Apparent depth = 2 + 5=7 cm                 \[So,1.5=\frac{\operatorname{Re}al\,depth}{7}\]                 \[\therefore \operatorname{Re}al\,depth=1.5\times 7=10.5\]


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