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Physics of the eye (A-level only)

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Question 4
1.

Which would be a correct lens prescription for a person with myopia and astigmatism?

Select one option:

  • −2.50−0.75110-2.50 \quad -0.75 \quad 110−2.50−0.75110
  • +2.50−0.75110+2.50 \quad -0.75 \quad 110+2.50−0.75110
  • −2.50−0.75290-2.50 \quad -0.75 \quad 290−2.50−0.75290
  • +2.50−0.75290+2.50 \quad -0.75 \quad 290+2.50−0.75290
[1]
2.

A student views a near object OOO and cannot see it clearly unaided. The student is diagnosed with hypermetropia and is prescribed a suitable correcting lens.

Using the correcting lens, an intermediate image is formed that can be viewed clearly by the student.

The student states that they can see OOO more clearly because the correcting lens forms a diminished intermediate image closer to their eye.

Discuss the validity of the student's statement. In your answer you should:

  • describe how hypermetropia affects vision
  • draw a labelled ray diagram of the correcting lens, showing how the intermediate image of OOO is formed
  • explain how the correcting lens enables the student to see clearly.
[6]
Markscheme

Physics of the eye (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Physics of the eye (A-level only)

11 exam-style questions on AQA A Level Physics Physics of the eye (A-level only), covering Physics of vision (A-level only) and Defects of vision and their correction using lenses (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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