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NTSE Sample Paper NTSE SAT Practice Test-15

  • question_answer
    A person with a myopic eye cannot see objects beyond a distance of 1.5 m. The power of the corrective lens used to restore proper vision is

    A) -0.67 D  

    B)        +0.67D

    C) +1.5D                          

    D) -1.5D

    Correct Answer: A

    Solution :

    [c] d= 1.5m The concave lens of focal length \[f\] is used to restore the proper vision. So, \[\frac{1}{f}=-\frac{1}{d}=-\frac{1}{1.5}\,\,m\] or \[f=-1.5\,m\]  \[\therefore \] Power of lens, \[P=\frac{1}{f}=-\frac{1}{1.5}=-0.67\]         


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