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A double convex lens is made of glass which has its refractive index of 1.55 for violet rays and 1.50 for red rays. If the focal length for violet rays is 20cm, then the focal length for red rays will be cm.

0 1 View | Posted a month ago
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  • 1 Answer

  • R

    Answered by

    Raj Pandey | Contributor-Level 9

    a month ago

    1 20 = ( 1.55 - 1 ) 1 R 1 - 1 R 2

    1 f = ( 1.50 - 1 ) 1 R 1 - 1 R 2

    Divide (1) by (2), f 20 = 0.55 0.50

    f = 22 c m

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