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[" 7.Light is incident normally on a dif...

[" 7.Light is incident normally on a diffaction grating "],[" through which the first diffaction is seen at "32^(@)" .In this "],[" ease the second order diffraction will be "],[" (a) at "80^(@)],[" (b) at "64^(@)],[" (c) at "48^(@)],[" (ol) there is no second order diffraction "]

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