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2 marksPhysics of the Ear and Eye

CAPE Physics Unit 1 · May/June 2024 · Paper 2 · Question 2(c)(ii)

A student measures object distances, u, and image distances, v, for a converging lens and plots uv against u + v as shown in Figure 3.

From the graph in Figure 3, determine a value for the focal length of the converging lens used.

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Other parts of this question

  1. 2(a)(i)Define depth of focus.[2 marks]
  2. 2(a)(ii)Define accommodation.[2 marks]
  3. 2(a)(iii)Define astigmatism.[2 marks]
  4. 2(b)Use annotated optical sketches to explain how short-sightedness occurs AND how the defect can be corrected.[5 marks]
  5. 2(c)(i)Show that the gradient of the graph in Figure 3 is equal to the focal length, f, of the converging lens.[3 marks]
  6. 2(c)(iii)Determine the power of the converging lens used in the experiment.[2 marks]
  7. 2(d)(i)State, in words, Snell's law.[2 marks]
  8. 2(d)(ii)Explain how total internal reflection occurs.[2 marks]
  9. 2(e)(i)Calculate the critical angle at the glass/liquid interface.[3 marks]
  10. 2(e)(ii)Calculate the angle of emergence of the ray from the cube.[1 mark]
  11. 2(f)Describe a simple experiment a teenager can perform to determine if the frequency response of his right ear is different from that of his left ear.[4 marks]

More practice: the rest of this paper · more Physics of the Ear and Eye questions · all CAPE Physics Unit 1 past papers