The ideal lens in an astronomical telescope focuses the image of a star at a distance of exactly 20 meters at a wavelength of 0.5 microns. The lens is 2 meters wide. 1. What is its Numerical Aperture? 2. What is the size of the image of the star? 3. What is the depth of focus? The astronomers decide to look at the moon instead, which is only 400,000 km distant. 4. How much does the focus change? Should they bother to focus the telescope? The moon is about 3500 km wide. 5. What is the size of the image of the moon?
The ideal lens in an astronomical telescope focuses the image of a star at a distance of exactly 20 meters at a wavelength of 0.5 microns. The lens is 2 meters wide. 1. What is its Numerical Aperture? 2. What is the size of the image of the star? 3. What is the depth of focus? The astronomers decide to look at the moon instead, which is only 400,000 km distant. 4. How much does the focus change? Should they bother to focus the telescope? The moon is about 3500 km wide. 5. What is the size of the image of the moon?
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Transcribed Image Text:The ideal lens in an astronomical telescope focuses the image of a star at a distance of exactly
20 meters at a wavelength of 0.5 microns. The lens is 2 meters wide.
1.
What is its Numerical Aperture?
2. What is the size of the image of the star?
3. What is the depth of focus?
The astronomers decide to look at the moon instead, which is only 400,000 km distant.
4. How much does the focus change? Should they bother to focus the telescope?
The moon is about 3500 km wide.
5. What is the size of the image of the moon?
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