Question

You are shopping for telescopes online. You find two in your price range. One of these has an aperture of $20 \mathrm{cm}$, and one has an aperture of $30 \mathrm{cm} .$ Which should you choose, and why? a. The $20 \mathrm{cm}$, because the light-gathering power will be better. b. The $20 \mathrm{cm}$, because the image size will be larger. c. The $30 \mathrm{cm}$, because the light-gathering power will be better. d. The $30 \mathrm{cm},$ because the image size will be larger.

Name: Problem 3, Chapter 6: 21st Century Astronomy
Uploaded: 2020-07-16T19:52:46-08:00
Duration: 45 s
Channel: Donald Albin

   You are shopping for telescopes online. You find two in your price range. One of these has an aperture of $20 \mathrm{cm}$, and one has an aperture of $30 \mathrm{cm} .$ Which should you choose, and why?
a. The $20 \mathrm{cm}$, because the light-gathering power will be better.
b. The $20 \mathrm{cm}$, because the image size will be larger.
c. The $30 \mathrm{cm}$, because the light-gathering power will be better.
d. The $30 \mathrm{cm},$ because the image size will be larger.

21st Century Astronomy

Laura Kay, Stacy… 4th Edition

Chapter 6, Problem 3

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Solved by Expert Donald Albin

07/16/2020

Step 1

The light-gathering power of a telescope is determined by the diameter of its aperture. The larger the aperture, the more light the telescope can gather, and the brighter and clearer the image will be. Show more…

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You are shopping for telescopes online. You find two in your price range. One of these has an aperture of $20 \mathrm{cm}$, and one has an aperture of $30 \mathrm{cm} .$ Which should you choose, and why? a. The $20 \mathrm{cm}$, because the light-gathering power will be better. b. The $20 \mathrm{cm}$, because the image size will be larger. c. The $30 \mathrm{cm}$, because the light-gathering power will be better. d. The $30 \mathrm{cm},$ because the image size will be larger.

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Key Concepts

Aperture

The aperture of a telescope is the diameter of its primary lens or mirror, which determines how much light the telescope can collect. A larger aperture means that the telescope can gather more light, thereby providing a brighter and clearer view of faint celestial objects.

Light-Gathering Power

Light-gathering power refers to a telescope's ability to collect light, and it increases with the square of the aperture's diameter. This means that a telescope with a larger aperture can detect and resolve fainter objects more effectively, making it a crucial factor in telescope performance.

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