A helium-neon laser 633nm illuminates a diffraction grating
A helium-neon laser (λ=633nm) illuminates a diffraction grating. The distance between the two m=1 bright fringes is 30 cm on a screen 2.2 m behind the grating.
1) What is the spacing between slits of the grating?
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a helium-neon laser lambda633nm illuminates a diffraction grating the distance between the twonbspm1 bright fringes is
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