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Calculating focal length from a number of focal ratios
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[QUOTE="andrevdh, post: 5481931, member: 35979"] Yes, that is how I have it too. I was trying to point the student in the correct direction by making him aware of this situation. The spectroscope has another collimating lens inside of it. If the cone of light is not of the right dimensions light is either wasted (it overshoots the collimating lens) or the collimated beam uses too small an area of the grating or prism to produce an effective spectrum. The final focal plane is positioned on the entry slit to the spectroscope. The spectrum are then images of the illuminated part of the entry slit. The spectroscope thus reproduces the astronomical object in slit images in the various parts of the spectrum. Spectroscopes have to be used correctly since it usually operate with very little light, especially in astronomy. [/QUOTE]
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Calculating focal length from a number of focal ratios
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