MHT CET 2022 Physics question
Consider the following statement about interference of light (a) The interference fringes are equally bright and equally spaced (b) At the centre of a bright fringe, the intensity is four times the intensity of the incident wave (c) For constructive interference of two waves, the crest of one wave coincides with trough of another wave. Which of the above statements are correct?
Solution
Statement (a) is true: in Young's double slit interference with two sources of equal intensity the fringes are equally spaced (width ) and have the same maximum brightness. Statement (b) is true: if each wave has intensity (amplitude ), the resultant amplitude at a bright fringe is , so
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