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Wave Optics - Diffraction Grating

Q1- Light from an argon laser strikes a diffraction grating that has 5310 grooves per cm. The center and the first order principal maximum are separated by 0.488 m on a wall 1.72 m from the grating. Determine the wavelength of the laser light.

Q2- A helium-neon laser (λ = 632 nm) is used to calibrate a diffraction grating. If the first order maximum occurs at 20.5 degree, what is the spacing between adjacent grooves in the grating?  

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