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Physics of the eye (A-level only)

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12
Question 2

A car driver must be able to:

  • read a dashboard instrument from a distance of 40 cm
  • read a road sign from a distance of 25 m

The driver has an unaided far point of 50 cm and an unaided near point of 20 cm.

1.

Identify the driver's eye defect.

[1]
2.

Explain where the image of the road sign is formed relative to the retina in the driver's unaided eye, and state how a corrective lens changes the path of the light rays to correct this defect.

[2]
3.

An optician considers three lenses for the driver:

  • Lens A: Power =−2.65 D= -2.65\text{ D}=−2.65 D
  • Lens B: Power =−1.96 D= -1.96\text{ D}=−1.96 D
  • Lens C: Power =+1.50 D= +1.50\text{ D}=+1.50 D

Deduce which lens is suitable for the driver while driving. Support your answer with calculations for the virtual image positions of both the dashboard and the road sign.

[6]

Physics of the eye (A-level only) Questions

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