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Chapter 6: Problem 7

Quite often advertisements appear for telescopes that extol their magnifying power. Is this a good criterion for evaluating telescopes? Explain your answer.

Short Answer

Expert verified
Magnifying power is an important factor in evaluating telescopes but it shouldn't be the only criterion. Other factors like aperture, resolution, quality of optics and stability of the mount also significantly contribute to the effectiveness of a telescope.

Step by step solution

01

Understand Magnification

Magnification is the ability to enlarge the image of a distant object. This depends on the focal length of the telescope and the eyepiece. While magnification is an important aspect of a telescope, it is not the only criterion to consider.
02

Consider Other Factors

Telescopes should also be evaluated based on other parameters. Important elements include aperture(the diameter of the lens or mirror that gathers light), resolution (the ability to distinguish between two close objects), stability of the mount, and the quality of the optics, which influences the clarity and sharpness of the image.
03

Conclusion

So while advertisements often emphasize magnification, it isn't necessarily the best evaluation criterion by itself. A good telescope would present a balance between good magnification, large aperture, high resolution, good quality optics and a stable mount. It's therefore necessary to consider these factors along with magnification when evaluating a telescope's quality.

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Most popular questions from this chapter

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What is diffraction? Why does it limit the angular resolution of a telescope? What other physical phenomenon is often a more important restriction on angular resolution?

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Obtain a telescope during the daytime along with several eyepieces of various focal lengths. If you can determine the telescope's focal length, calculate the magnifying powers of the eyepieces. Focus the telescope on some familiar object, such as a distant lamppost or tree. DO NOT FOCUS ON THE SUN! Looking directly at the Sun can cause blindness. Describe the image you see through the telescope. Is it upside down? How does the image move as you slowly and gently shift the telescope left and right or up and down? Examine the eyepieces, noting their focal lengths. By changing the eyepieces, examine the distant object under different magnifications. How do the field of view and the quality of the image change as you go from low power to high power?
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