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10th Class Science Human Eye and Colourful World Question Bank The Human Eye and the Colourful World

  • question_answer
    A man with myopic eyes cannot see objects at a distance of more than 60 cm from his eyes. Find the power of the lens to be used.

    A) -1.66 D                                 

    B) +60 D    

    C) -60 D                    

    D) \[\frac{1}{1.66}D\]

    Correct Answer: A

    Solution :

    The focal length of the required concave lens is 60 cm. \[Power\,P=\frac{1}{f}=\frac{1}{-0.6}=-1.66\,D\]


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