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TRUE/FALSE and explain: When monochromatic light passes through two narrowly spaced slits in phase, there will...

TRUE/FALSE and explain:

When monochromatic light passes through two narrowly spaced slits in phase, there will always be a region of constructive interference on the viewing screen directly between the slits.

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Answer #1

True

when monochromatic light passes through two narrowly spaced slits in phase, there will always be a region of constructive interference on the viewing screen directly between the slits because  

the condition for the constructive interference is the path difference =m*lambda

and the relation between the phase difference and path diffference is

phase difference = (2pi/Lambda)(path difference)

here both waves are in phase so the interference is constructive interference only

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