Why is the telescope so useful

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If the eye and telescope are so similar, then why is the telescope so useful?

The telescope has an opening (called an aperture) of about 6 inches. How much wider is that than your pupil? Does the telescope let in more light than your eye? About how many times more light? (Think: Is it the width of the opening or the area of the opening that counts?)

The telescope has a maximum useful exposure time of 60 seconds, during which it collects light. How does this compare with the "exposure time" of your own eye? How many times longer than your eye can the telescope let in light for a single image? How does this allow the telescope to see fainter objects than your eye? Why not just make the telescope's exposure time as long as possible? What might be a drawback to very long exposures?

Reference no: EM133228750

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