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NEET 2023

NEET 2023 Physics question on Ray Optics

Two thin lenses are of same focal lengths (ff), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be
  1. A.
    Zero
  2. B.
    f4\dfrac{f}{4}
  3. C.
    f2\dfrac{f}{2}
  4. D.
    Infinite
Show answer

Correct option: D

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