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Which of the following statements is FALSE? 1. Focal length of a convex lens is positive. 2. Focal length of a concave lens is negative. 3. All measurements to the right of the optic centre are positive. 4. All measurements to the left of the optic centre are positive. 

Which of the following statements is FALSE? 1. Focal length of a convex lens is positive. 2. Focal length of a concave lens is negative. 3. All measurements to the right of the optic centre are positive. 4. All measurements to the left of the optic centre are positive.  Correct Answer Statement 4 only 

Option 3 is correct, i.e. All measurements to the left of the optic centre are positive.

  • Focal length of a convex lens is positive.
  • Focal length of a concave lens is negative.
  • All measurements to the right of the optic centre are positive.
  • All measurements to the left of the optic centre are negative. 

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