A double-convex lens of radii r1 = +10 cm and r2 = 10 cm is made from

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A double-convex lens of radii r1 = +10 cm and r2 = –10 cm is made from glass with indexes of refraction of 1.53 for blue light and 1.47 for red light. Find the focal length of this lens for

(a) Red light and

(b) Blue light.


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