# How many slits are needed in a diffraction grating that must resolve the m = 1...

How many slits are needed in a diffraction grating that must resolve the m = 1 maxima of two spectral lines at lambda_s = 610 nm and lamd_1 = 615 nm? A 0.500-mu m-thick flake of glass (n_glass = 1.52) from a broken cover slip is floating on water (n_water = 1.33). If white light initially travelling in the air (n_air = 1.00) is incident normal to the surfact of the glass, what wavelengths in the visible spectrum undergo constructive interference as the white light is reflected from the top bottom surfaces of the glass?

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