sunmoonlight
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for the second one, the path difference is given by mλ where m denotes which maximum you’re at. in this case m = 1 so the path difference is just λ pretty sure
This is the Double Slit Experiment. Go look up the Physics formula sheet and you will find a formula that links the positions of constructive interference in the interference pattern with the wavelength of light and the spacing d between the slits. Then you just have to interpret the information provided and apply the constructive interference equation, but note that the first diagram shows P1 and P2 converge at the second destructive interference fringe. The best answer is (C).How to do this kind of question?
That is correct. The answer is an irrational number, but in an exam you have to choose the closest option which is (C).for the first one you can approximate to get something close to an option: