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

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saliniBest ResponseYou've already chosen the best response.1
i dont think r.i is gonna affect the focal length as R=2f it is accepted and derived
 2 years ago

TaufiqueBest ResponseYou've already chosen the best response.0
\[1/f=((\mu2\div \mu1)1)(1\div R11\div R2)\] 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 \[f\].
 2 years ago

AadarshBest ResponseYou've already chosen the best response.0
Yeah got it. Thanks a lot. Answer = 20 cm
 2 years ago

AadarshBest ResponseYou've already chosen the best response.0
@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.
 2 years ago

AadarshBest ResponseYou've already chosen the best response.0
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
 2 years ago

AadarshBest ResponseYou've already chosen the best response.0
Post the answers in the respective links itself.
 2 years ago
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