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/sci/ - Science & Math

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6079448 No.6079448[DELETED]  [Reply] [Original]

So I have a lens which focuses light rays. Like in a camera.
What is the relationship between focal length and focused object size? I understand that bigger focal length=bigger zoom=less bright but are there any equations?

>> No.6079460
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6079460

bump

>> No.6079469
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>> No.6079476
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>>6079469

>> No.6079489
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>> No.6079488
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6079488

Snell's law/principle of least time?
I don't think I've done this since my high school geometry class.
You should be able to get some idea from the wikipedia articles on lens and mirrors.

>> No.6079517

>>6079488
oh shit its just geometry
I thought it had to do with wavelengths etc