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      Question

      Which of the following statements are correct?

      (a) For a lens, the first principal focus is the position of the object whose image is at infinity. (b) For a lens, the first principal focus is the position of the object whose image is formed at twice the focal length. (c) For a lens, the second principal focus is the position of the real image whose object is at infinity. (d) For a lens, the second principal focus is the position of the object whose image is formed at twice the focal length.
      A Both (a) and (c) Correct Answer Incorrect Answer
      B Both (b) and (d) Correct Answer Incorrect Answer
      C Both (b) and (c) Correct Answer Incorrect Answer
      D Both (a) and (b) Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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