Which one of the following conditions will result in the spectral lines of two d

Question

Which one of the following conditions will result in the spectral lines of two different wavelengths of light
occurring at the same angular location after passing through a grating?
a. There are no conditions for which this will occur - the spectral lines of two different wavelengths can
never occur at the same angular location.
b. The product of m (order) and ? must be the same for both wavelengths.
c. The slit separation must be an integral multiple of both of the wavelengths.
d. The slit separation must equal the average of the two wavelengths.

Explanation / Answer

b. The product of m (order) and ? must be the same for both wavelengths.

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