In the characterization of a diffraction grating, a student used a blue laser (λ =442 nm ). The screen where she was pro

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In the characterization of a diffraction grating, a student used a blue laser (λ =442 nm ). The screen where she was pro

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Got this wrong. How do i go about this
In the characterization of a diffraction grating, a student used a blue laser (λ =442 nm ). The screen where she was projecting the laser was 1.75 m from the grating and the first order of diffraction appeared 1.65 m away from the bright spot of the undiffracted beam. Calculate the spacing of the grating in mm−1
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