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Chapter 35: Q.1. (page 1016)

Suppose you wanted special glasses designed to let you see underwater without a face mask. Should the glasses use a converging or diverging lens? Explain.

Short Answer

Expert verified

Glasses with converging lenses

Step by step solution

01

Step `1.Given Information and concept

A normal mask has a flat plastic, so that light hitting your eyes comes from air. Since the n for water is near that of the eye, there is no convergence created by the cornea. To fix this, you would need a converging lens whose focal length in water is about the focal length of your cornea in air.

02

Step 2. Simplify

Indices of refraction of cornea and water are similar, hence light rays will converge less. Glasses with converging lenses will be suitable to look in underwater situation.

So, the answer is \text{\underline{Glasses with converging lenses. Glasses with converging lenses.


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Most popular questions from this chapter

A converging lens with a focal length of 40cmand a diverging lens with a focal length of -40cmare 160cmapart. A 2cmtall object is 60cmin front of the converging lens.

a. Use ray tracing to find the position and height of the image. Do this accurately using a ruler or paper with a grid, then make measurements on your diagram.

b. Calculate the image position and height. Compare with your ray-tracing answers in part a.

A microscope with a tube length of 180mmachieves a total magnification of 800Xwith a 40Xobjectives and a 20Xeye piece. The microscope is focused for viewing with a related eye. how far is the sample from the objective lens?

A 15cm-focal-length converging lens is 20cmto the right of a 7.0cm-focal-length converging lens. A 1.0cm-tall object is distance L to the left of the first lens.

a. For what value of L is the final image of this two-lens system halfway between the two lenses?

b. What are the height and orientation of the final image?

You鈥檝e been asked to build a telescope from a 2.0xmagnifying lens and a 5.0xmagnifying lens.

a. What is the maximum magnification you can achieve?

b. Which lens should be used as the objective? Explain.

c. What will be the length of your telescope?

Marooned on a desert island and with a lot of time on your hands, you decide to disassemble your glasses to make a crude telescope with which you can scan the horizon for rescuers. Luckily you鈥檙e farsighted, and, like most people, your two eyes have different lens prescriptions. Your left eye uses a lens of power +4.5Dand your right eye鈥檚 lens is +3.0D. a. Which lens should you use for the objective and which for the eyepiece? Explain.

b. What will be the magnification of your telescope?

c. How far apart should the two lenses be when you focus on distant objects?
See all solutions

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