Physics, 19.10.2020 14:01, laneey3760

How do you find the total number of nodes in a two-source interference pattern? I know the formula is like Na=d/lambda but apparently, according to my physics teacher, you have to go one step further to find the total number of nodes. But he never showed us how, and I cant find anything online.

Like for example if the distance between the two sources was 20cm and the wavelength was 2cm, then it would be 20/2=10 right? But my teacher said its wrong. And he wont explain why.

I have a test on this tomorrow please help

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How do you find the total number of nodes in a two-source interference pattern? I know the formula...