Power of Lenses. The Human Eye Practice Questions

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12.10Power of Lenses. The Human Eye

Physics Revision Questions for Power of Lenses. The Human Eye

1. An optician prescribes spectacles to a patient with a combination of a converging lens of focal length 40 cm and diverging lens of focal length 25 cm. What is the power of these spectacles?

  1. 6.0 D
  2. -6.0 D
  3. 1.5 D
  4. -1.5 D

Correct Answer: D

2. A student wants to construct an optical system made by two identical converging lenses with focal lengths of 20 cm each. How far from each other must he place the lenses to obtain an optical power of -10 D for this system?

  1. 0.8 m
  2. 3.96 m
  3. 3960 m
  4. 247.5 m

Correct Answer: A

3. The typical distance between the eye-lens and retina is 2.5 cm. A patient goes to an oculist who discovers that the light rays converge at a distance of 2.3 cm from the eye-lens, as shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Power of Lenses. The Human Eye

Which is correct for the lens the doctor prescribes the patient to correct his sight if the optical glasses must have 1 cm distance from the eye-lens?

  1. Converging lens of focal length 16.25 cm
  2. Diverging lens of focal length 6.15 m
  3. Diverging lens of focal length 16.25 cm
  4. Diverging lens of focal length 6.15 cm

Correct Answer: C

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