I have a pinhole 50 microns in size illuminated by a coherent laser beam. Now, I...

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Physics

I have a pinhole 50 microns in size illuminated by a coherentlaser beam. Now, I have a lens (75mm focal length) 1 focal lengthfrom this pinhole, what size will the beam be when it is incidenton this 75mm lens?

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We haveSize or diameter of the pinhole Focal length of the lens Linear magnification    See Answer
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