Question

what are the condition for bright and dark fringes

Answer 1

Explanation:

The bright fringe in the middle is caused by light from the two slits traveling the same distance to the screen; this is known as the zero-order fringe. The dark fringes on either side of the zero-order fringe are caused by light from one slit traveling half a wavelength further than light from the other slit.

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Answer 2

Answer:

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Explanation:

Light from one slit travels a distance that is ½ wavelength longer than the distance traveled by light from the other slit. This pattern of bright and dark lines is known as an interference fringe pattern. ... The dark fringes on either side of the zero-order fringe are caused by destructive interference.