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Chapter 31: Problem 3

If you're handed a converging lens, what can you do to estimate its focal length quickly?

Short Answer

Expert verified
Find a faraway object and using the lens, project its clear image onto a white paper. Measure the distance from the image to the lens. This measurement is approximately the focal length of the lens. Repeat and average the measurements to get a more accurate result.

Step by step solution

01

Concepts

Understand the concept of a converging lens: A converging lens, or a convex lens, is a lens which converges light beams coming towards it to a specific point, which is called the focal point. The distance from the center of the lens to the focal point is defined as the focal length.
02

Preparations

Find a distant object, preferably something that's not moving such as a building or a tree. The object should be at least a few meters away from you. If it's dark outside or you're inside, you can use a light source instead.
03

Experiment

Hold the lens with one hand between the object and a white piece of paper. Move the lens towards the paper until a clear, sharp image of the object appears on the paper. This image is the 'real image' created by the lens.
04

Measurement

Measure the distance from the lens to the paper. This distance is approximately the focal length of the lens.
05

Repeat

For more accurate results, repeat Steps 3 and 4 a few times and take the average of the measurements.

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Most popular questions from this chapter

LCD projectors commonly used for computer and video projection create an image on a small LCD display (see Application on page 369 ). The display is mounted before a lens and illuminated from behind. In a projector using a \(7.50-\mathrm{cm}\) -focal-length convex lens, where should the LCD display be located so the projected image is focused on a screen \(6.30 \mathrm{m}\) from the lens?

By holding a magnifying glass \(25 \mathrm{cm}\) from your desk lamp, you can focus an image of the lamp's bulb on a wall \(1.6 \mathrm{m}\) from the lamp. What's the focal length of your magnifying glass?

Is there any limit to the temperature you can achieve by focusing sunlight? (Hint: Think about the second law of thermodynamics.)

At what two distances could you place an object from a \(45-\mathrm{cm}-\) focal-length concave mirror to get an image 1.5 times the object's size?

An object and its lens-produced real image are \(2.4 \mathrm{m}\) apart. If the lens has \(55-\mathrm{cm}\) focal length, what are the possible values for the object distance and magnification?
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