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JEE Main & Advanced Physics Ray Optics Question Bank Self Evaluation Test - Ray Optics and Optical Instruments

  • question_answer
    Two lenses of focal length \[{{f}_{1}}=10cm\] and \[{{f}_{2}}=20cm\] are kept as shown. The resultant power of combination will  be

    A) -10 D               

    B) 5 D  

    C) 0                                 

    D) 10 D

    Correct Answer: D

    Solution :

    [d] \[P=2\left[ \frac{100}{10}+\frac{100}{-20}+0 \right]\text{     P=10 diotre}\text{.}\]


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