Question

  Two thin lenses of power +3.5 D and -2.5 D are placed in contact. The power of the lens combination is            A.    1D                             B.    +1.5D                           C.    +2.5D                              D.   + 2D​

Answer 1

Answer:

Total power = sum of powers of all lenses.

3.5D + (-2.5D)

⇒ +1.0D

Answer 2

Answer:

1D

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