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NTSE Sample Paper NTSE SAT Practice Test-20

  • question_answer
    When a glass slab is placed on a the paper it appears to be raised by 4 cm when viewed normally. If the refractive index of glass is 1.5, the thickness of the slab is  

    A) 5 cm                

    B)        6 cm         

    C) 10cm                           

    D) 12cm        

    Correct Answer: D

    Solution :

    [d] Let real depth = t Apparent depth \[=\text{ }t\text{ }-\text{ }4\]  \[Using\text{ }\mu =\frac{Real\text{ }depth}{Apparent\text{ }depth}\]    or \[1.5=\frac{t}{t-4}\] or \[3t-12=2t\]or t = 12 cm


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