What really is the deal with diffraction?

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aftab
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What really is the deal with diffraction?
8 months ago

1. What is diffraction limit? Is it when two adjacent Airy discs start to overlap each other? Is it when one Airy disc begin to cover two or more adjacent pixels? Both?

2. Does pixel pitch or size of the pixels affect diffraction limit? If they do then why we do we say diffraction limit is a property of the optical system only?

3. Does focal length affect diffraction limit?

Thanks.

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