For a converging lens with two convex surfaces, the radius of curvature for both surfaces is 20 cm. If the focal length is 10 cm, what must the index of refraction be?
a. 1.5
c. 2.0
b. 2.5
d. 3.0
C
Physics & Space Science
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Estimation: A reasonable estimate for the height of an ordinary adult male is
A. 50 cm. B. 70 cm. C. 200 cm. D. 300 cm.
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