Help with physics homework Two beams of coherent light from the same source trav

Question

Help with physics homework

Two beams of coherent light from the same source travel different paths, arriving at point P. If completely destructive interference is to occur at point P. which of the following could be the path difference between the two waves? The path difference between the two waves could be one-quarter of a wavelength. The path difference between the two waves could be one wavelength. The path difference between the two waves could be two and one-ha If wavelengths. The path difference between the two waves could be one-half of a wavelength. The path difference between the two waves could be two wavelengths.

Explanation / Answer

for completely distructive phase difference is pi

then path difference = lambda/2pi*phase difference = lambda/2pi*pi = lambda/2

so path differnece between the two waves could be one-half of a wavelength

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