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Question

Two lenses of power +12 D and -2 D are put in contact. What is their equivalent focal length?
  1. 10 cm
  2. 12.5 cm
  3. 16.6 cm
  4. 8.33 cm

A
10 cm
B
12.5 cm
C
16.6 cm
D
8.33 cm
Solution
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