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5 marksPhysics of the Ear and Eye

CAPE Physics Unit 1 · 2009 · Paper 2 · Question 5(b)(iii)

A student can only see objects clearly if they are more than 80 cm from her eyes. The normal near point is 25 cm from the eye.

Draw a second ray diagram to show how a lens may be used to correct the defect for an object set at 25 cm from the eye.

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Other parts of this question

  1. 5(a)(i)Explain what is meant by 'Accommodation' as it relates to the human eye.[1 mark]
  2. 5(a)(ii)Explain what is meant by 'Depth of focus' as it relates to the human eye.[1 mark]
  3. 5(b)(i)Name the student's eye defect.[5 marks]
  4. 5(b)(ii)Copy Figure 3 onto your answer booklet. On the copied diagram, draw a ray diagram to illustrate the paths of two light rays from a point object at the normal…[5 marks]
  5. 5(c)(i)Calculate the position of her near point at age 45.[4 marks]
  6. 5(c)(ii)Calculate the position of her near point at age 55.[2 marks]
  7. 5(c)(iii)Calculate the power of the lens of the reading glasses now required so that she can again read at 25 cm.[2 marks]

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