# Power of Lenses. The Human Eye Practice Questions

The following physics revision questions are provided in support of the physics tutorial on Power of Lenses. The Human Eye. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Power of Lenses. The Human Eye tutorials. The Power of Lenses. The Human Eye calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

Not sure on some or part of the Power of Lenses. The Human Eye questions? Review the tutorials and learning material for Power of Lenses. The Human Eye

Optics Learning Material
Tutorial IDTitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
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

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

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.

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

## Whats next?

Enjoy the "Power of Lenses. The Human Eye" practice questions? People who liked the "Power of Lenses. The Human Eye" practice questions found the following resources useful:

1. Practice Questions Feedback. Helps other - Leave a rating for this practice questions (see below)
2. Optics Physics tutorial: Power of Lenses. The Human Eye. Read the Power of Lenses. The Human Eye physics tutorial and build your physics knowledge of Optics
3. Optics Revision Notes: Power of Lenses. The Human Eye. Print the notes so you can revise the key points covered in the physics tutorial for Power of Lenses. The Human Eye
4. Check your calculations for Optics questions with our excellent Optics calculators which contain full equations and calculations clearly displayed line by line. See the Optics Calculators by iCalculator™ below.
5. Continuing learning optics - read our next physics tutorial: Features of Light