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Optics is the study of light, and its interaction with matter. It includes topics such as imaging systems, fiber optics, lasers, quantum optics, and more.

1 vote
2 answers
2k views

Why does shorter focal length result in greater beam divergence?

So I got 2 converging Fresnel lenses, one with 50 mm focal length and other 70 mm. My experiment looks like this: When trying to focus and SMD LED emitter into a narrow beam (sticking to lenses fo …
eyeballpaul's user avatar
3 votes
2 answers
1k views

Why is it possible to couple multiple wavelengths into a single mode optical fiber?

I'm quite new to the mode theory, but as I understand, single mode fiber should only allow a single pattern of wavelength + polarization. I'm assuming a non-modulated non-coherent light (a white LED, …
eyeballpaul's user avatar