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A students plots a graph between inverse of magnification 1 / m produced by a convex thin lens and the object distance u as shown in figure. What was the focal length of the lens used?

Options

  1. Ab c a
  2. Bb c a
  3. Cc b
  4. Db c

Correct answer

C. c b

Step-by-step solution

Lens formula, 1 v - 1 u = 1 f or u v -1= u f 1 ~m -1= u f or 1 ~m = ( 1 f ) u +1 this is the equation of a straight line whose slope 1 f - b c 1- c b

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