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3

Well in principle, it's pretty easy. The example of the Sun is often taught in introductory astronomy laboratory courses. The Sun is a nice clean example because it is so bright compared to anything that might contaminate its spectrum. You just put some sunlight through a diffraction grating (or slit, or prism) that you've previously calibrated so that you ...

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Telescope is an Optical device which capture more light & gives you more clear, sharper & deeper view of the object under observation. So It is possible to make an Telescope with single lens (You may call it a telescope), but It will not justify properly the use & its efficiency for which it is used! Also the eye piece (the lens nearer to your ...

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The term "focusing" means something else than the OP suggests. It means that the different light rays coming that a single, specific point $P$ of the object emits to different directions re-converge back and reach the same place of the retina. If the object, and/or its point $P$, is infinitely (very) far, then the light rays coming from $P$ are (nearly) ...

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