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A biconvex lens has radii of curvature, 20cm each, If the refractive index of the material of the lens is 1.5 , the power of the lens is:

Option 1 -

+ 2 D

Option 2 -

+ 20 D

Option 3 -

+ 5 D

Option 4 -

infinity

0 2 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • R

    Answered by

    Raj Pandey | Contributor-Level 9

    a month ago
    Correct Option - 3


    Detailed Solution:

    P = 1 f = ( μ - 1 ) 1 R 1 - 1 R 2

    P = 3 2 - 1 1 0.2 + 1 0.2

    P = 1 2 2 0.2 = 10 2 = + 5 D

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