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  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light

  • question_answer
    The focal length of a lens of refractive index 3/2 in air is 30 cm. What will be its focal length when is immersed in water of refractive index 4/3?

    A)  60 cm                  

    B)         120 cm  

    C)  240 cm                

    D)         None of these

    Correct Answer: B

    Solution :

     When a lens of \[\mu \] exactly equal to \[1\cdot 5\] is immersed in water of \[\mu \] exactly equal to\[4/5\], its focal length becomes four times.


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