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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Nitin meel
ya it's correct . as it is written about the (1 0 0) plane which is in 2D. From diagram or just assume for a plane that there is a square and there are four circles on the each corner of square then what's the total contribution of circles to square =1/4 *4 (imagine the 2D only ,don't get confused in 3D cube,as written)