Question

I need help with this question. Would you be able to explain it please?

Double slit interference patterns exhibit mλ path difference for constructive interference. Single slit diffraction patterns exhibit (m+1/2)λ path difference for constructive interference. With the use of diagrams, explain how constructive interference is achieved for each and why there is a different path difference requirement for constructive interference

Answer 1

OK
for double slit experiment you have 2 opens

if you take more than one piont the result will be the same as

For single slit experiment you have only one open, so you will take the interaction between every point in that open with each other like