When a telescope takes an image of an astronomical object, a shutter above the d

Question

When a telescope takes an image of an astronomical object, a shutter above the detector is opened to allow light to enter at the start of an exposure, and it is left open for a specified integration time. After the exposure is complete, the shutter closes and all the light that was gathered during that time is combined into a single image.

The integration time of the human eye is about 0.1 second.

If you had a telescope with the same-sized lens (and same focal length) as the human eye, what would be the benefit of taking an exposure of a steady light source with an integration time of 10 seconds?

A. The light source would appear larger in the image (higher magnification).

B. The light source would appear brighter in the image.

C. There would be no benefit, because the dimensions of the telescope are the same as those of the human eye.

D. The resolution of the image would be better.

Explanation / Answer

If the integration time increases to 10seconds, then we will get a more detailed image. Usually compared to the human eye, we get a more detailed image by using a telescope which has long integration time, maybe upto hours.

So the answer is option D. More detailing results in better resolution.

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