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Deduce a equivalent focal length of two convex lenses of focal lengths f1 and f2 when placed in contact. |
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Answer» he lens addition formula adds the reciprocal of the component focal LENGTHS , the resulting focal length will be 1/2 the original focal length.Here’s the break down: 1/f = 1/F1 + 1/f2. where f1 = f2.1/f = 1/f1 + 1/f1 = 2/f1, so f = f1/2.Similarly, if THREE lenses were placed in contact, then the COMBINED focal length would be 1/3 of a SINGLE lens.I hope this will help youIf not then comment me |
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