Suppose you set up a double-slit interference experiment with blue light. You us

Question

Suppose you set up a double-slit interference experiment with blue light. You use photographic film to register the bright and dark regions on the viewing surface. Fix your attention on the first dark region, where the photographic film is NOT exposed (because no blue light appears there). Now suppose you leave everything as it was but switch to an ultraviolet light source. For your earlier and present sources, the relationship of the wavelengths is this: ultraviolet = 1/2blue. Will the film at the location "first dark for blue" remain unexposed? Explain your reasoning carefully.

Explanation / Answer

at the place of first dark for blue there will be second order dark fringe for ultravoilet ray so yes that place will remain dark.

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