Laser light is projected into two small slits that are 1mm apart. The fringe pattern on the screen is missing the 4th bright fringe. That is, there is a bright center fringe and three more bright fringes in either direction of the central bright fringe, but the 4th one missing. For the matter, the 8th is missing too. What is the size of the slit(s)? Hint: it is missing because of diffraction.

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Tens screen Tens screen