Observing time that can be saved by using a CCD instead of a photographic plate.

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Chapter 6, Problem 39QP

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Observing time that can be saved by using a CCD instead of a photographic plate.

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Astronauts observing from a space station need a telescope with a resolving power of 0.9 arc seconds at a wavelength of 540 nm and a magnifying power of 260. Design a telescope to meet their needs. (State the necessary primary diameter of the telescope, in m, and the ratio of the focal lengths below. Also, what will its light-gathering power be, compared with a dark adapted human eye? (Assume that the pupil of your eye can open to a diameter of about 0.8 cm in dark conditions.)

The photographic equipment on a telescope is replaced by a CCD. If the photographic plate records 5 percent of the light reaching it, but the CCD records 90 percent, how much time will the new system take to collect as much information as the old detector recorded in a 1-hour exposure?

Astronauts observing from a space station need a telescope with a resolving power of 0.9 arc seconds at a wavelength of 540 bam and a magnifying power of 260. Design a telescope to meet their needs. (State the necessary primary diameter of the telescope, in m, and the ratio of the focal lengths below. Also, what will its light-gathering power be, compared with a dark adapted human eye? (Assume that the pupil of your eye can open to a diameter of about 0.8 cm in dark conditions.)