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Old Nov 8th 2018, 12:31 AM   #1
ohm
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Diameter and radius of central bright

I have read two different value in diffraction pattern.
One is angular radius of central bright is given 1.22 lamda/D
Other is diameter of central bright is kanda/D.
Which one is correct. ?
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Old Nov 8th 2018, 02:28 AM   #2
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What is "kanda"?
does perhaps kanda=1.22 lamda?
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Old Nov 8th 2018, 03:16 AM   #3
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Originally Posted by Woody View Post
What is "kanda"?
does perhaps kanda=1.22 lamda?
Yeah, it's lambda.

It depends what you are talking about. The value $\displaystyle 1.22 \lambda$ is the distance to the first minimum from the centre of an Airy disk.

If you have some other pattern, you might instead have a different formula.
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Old Nov 8th 2018, 04:19 AM   #4
ohm
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Yes. That is lamda..
In case of diffraction from circular aperture radius of central bright is given as 1.22 lamda/D
In case of fresnel calculation diffraction from circular aperture diameter is given as kanda/D ....How?
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Old Nov 8th 2018, 06:37 AM   #5
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If "kanda" was simply a misprint for "lambda", why do you keep writing it?
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