Any math to corelate B&W printing times to print size?

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just a-wondering...

does the law of light intensity dropping i proportion to the square of the distance apply to B&W enlargers?

i mean if a print with the head at X height will I have to inrease time 4 times for a 2X printing height? will opening the aperture 2 stops be the same? (that is for approximations and quriosity only)
are there any details not obvious in this issue?

thanks, kostas


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