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# For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 10cm. I

Physics

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Queson:
For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 10cm. If the
focal is 10cm, what must index of refracon be?
You need to use the formula:
1/f = (n-1)(1/R1+1/R2) where f is the focal length, n is the index of refraction, and R is the radius of
curvature
so now we can solve for n
1/10 = (n-1)(1/10+1/10) = (n-1)(2/10) = (n-1)(1/5)
(5)(1/10) = (n-1)(1/5)(5)
1/2 = n-1
n = 1+1/2 = 3/2 = 1.5

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Question:For a converging lens with two curved surfaces, the radius of curvature for both surfaces is 10cm. If the focal is 10cm, what must index of refraction be?Answer:You need to use the formula:1/f = (n-1)(1/R1+1/R2) where f is the focal length, n is the index of refraction, and R is the ra ...
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