For exams, you must draw each setup perfectly and label every λ, d, and D. The formulas live in the spacing of your lines. I know this because I mark science papers. The children who pass press their rulers so hard the paper groves, like the channels we cut for dye to flow true on cloth. The clever ones who scribble the answer but their diagram is sloppy? They lose marks. Precision in the pattern is everything.
#exams#study
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