# Physics

1. Yellow light of wavelength 5.5 x 10^-7 m is incident normally at a diffraction grating with 300 lines per mm. Calculate the angle between the first-order and second-order maxima.
2. Blue light of wavelength 4.5 x 10^-7 m is incident normally at a diffraction grating with 100 lines per mm. Calculate the maximum number of orders that can be observed.

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1. Someone pleaseee help me out

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