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Aadarsh

  • 4 years ago

The radius of curvature of the convex surface of a plano-convex lens is 10 cm. What is the focal length of the plano-convex lens?(Here, "mu" = 1.5) a) 10 cm b) 20 cm c) 15 cm d) 5 cm

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  1. salini
    • 4 years ago
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    i dont think r.i is gonna affect the focal length as R=2f it is accepted and derived

  2. Taufique
    • 4 years ago
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    \[1/f=((\mu2\div \mu1)-1)(1\div R1-1\div R2)\] this is lens maker formula.. here \[\mu1\] is refractive index for air and\[\mu 2\] is the refractive index of the lens(medium).R1 is 10cm and R2 is the infinity(for plane). put this value in the above equation and find \[f\].

  3. Aadarsh
    • 4 years ago
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    Yeah got it. Thanks a lot. Answer = 20 cm

  4. Aadarsh
    • 4 years ago
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    @salini didi, I found this question in my study material, and "R = 2f" answer did not match the correct option. @Taufique bhaio, ur answer is absolutely correct. Thanks once again.

  5. Aadarsh
    • 4 years ago
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    I request both of you to try 3 more questions. The links are given below. Please help me. 1) http://openstudy.com/study?login#/updates/4f7abf86e4b0884e12aac466 2) http://openstudy.com/study?login#/updates/4f7abd41e4b0884e12aac33c 3) http://openstudy.com/study?login#/updates/4f7abb4de4b0884e12aac1e7

  6. Aadarsh
    • 4 years ago
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    Post the answers in the respective links itself.

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