What is the distance between the first-order red and blue fringes?
The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm (red) and 486 nm (blue). Light from a hydrogen lampilluminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 m behind the grating.
What is the distance between the first-order red and blue fringes?
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