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[" 9.A slit of width a is illuminated by...

[" 9.A slit of width a is illuminated by white light.For red light "(lambda=6200 AA" ),the first minima is "],[" obtained at "theta=30^(@)" .Then the value of a will be."],[[" (1) "3250 AA," (2) "6.5times10^(-4)mm," (3) "1.24" microns "," (4) "2.6times10^(-4)cm]]

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