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6 marksPhysical Quantities

CAPE Physics Unit 1 · 2002 · Paper 2 · Question 6(e)

The focal length of a lens can be found by measuring several values of image distance V, corresponding to different values of the object distance U, using a pin or no parallax method.

Explain how, by plotting a suitable graph, the focal length of the lens could be determined from the data collected. Include a sketch of the graph you would expect to obtain.

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Other parts of this question

  1. 6(a)Define the term 'principal focus of a lens'.[2 marks]
  2. 6(b)Draw a ray diagram to illustrate the formation of the image of an extended object by a convex lens when the object is at a distance from the lens, greater than…[2 marks]
  3. 6(c)(i)Draw a ray diagram to show how an image is formed in a diverging lens.[4 marks]
  4. 6(c)(ii)Compare the images formed in (b) and (c)(i).[4 marks]
  5. 6(d)(i)How far above the transparency must the lens be held in order for the image to be formed on the screen?[6 marks]
  6. 6(d)(ii)What is the magnifying power of the lens and how does this affect image formed?[6 marks]

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