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NEET 2008 (AIPMT) · Combination of Lenses

Combination of Lenses question from NEET 2008 (AIPMT)

Q75NEET 2008 · AIPMTEasy

Combination of Lenses

Two thin lenses of focal lengths f1 and f2 are in contact and coaxial. The power of the combination is

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Answer: (b)

  1. For lenses in contact P=1f1+1f2P = \frac{1}{f_1} + \frac{1}{f_2}.
  2. P=f1+f2f1f2P = \frac{f_1 + f_2}{f_1 f_2}
  3. So the answer is (b) f1+f2f1f2\frac{f_1 + f_2}{f_1 f_2}.
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