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A biconvex lens made of material with refractive index n2. The radii of curvatures of its left surface and right surface are R1 and R2. The media on its left and right have refractive indices n1 and n3 respectively. The first and second focal lengths of the lens are respectively f1 and f2.Assume that n1 = n3. Which of the following statements is not correct? (a) f1 = f2. (b) f2 is inversely proportional to n3 - 1. (c) If R1 and R2 are unequal, the focal length would depend on the direction in which light travels through the lens. (d) f1 may be negative if n1 > n2. |
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Answer» Correct Answer is: (c) If R1 and R2 are unequal, the focal length would depend on the direction in which light travels through the lens. |
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