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7. (a) In a lecture demonstration laser light is used to illuminate two identical narrow slits that are separated by 0.2 min,
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0,2mm = 0, 2 x 10-3 m. d = D=6m U2y = 30cm = 0.3cm using the equation for ith bright foringe Un=ndo 0.30 = 27% dx 6 0,2x10-3

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