PHYSICS - OPTICS (wave optics) Topic in textbook: Coherence (and double-slit) Qu

Question

PHYSICS - OPTICS (wave optics) Topic in textbook: Coherence (and double-slit) Question: Red light of 600.0 nm wavelength is used to produce double-slit interference. (a) If the double slits are separated by 1.5 mm, and if they are 2.0 m from the source, how narrow a slit should be placed in front of the source if fringes are to be observed? (b) If instead a spherical source is used, with a diameter the same as the limiting slit size of (a), how much closer can it be placed to the double slit and still observe fringes? Please highlight relevant equations, show step-by-step solutions and answer. Thx

Explanation / Answer

I can't see the problem, though. Slits in a Young experiment become two sources of coherent light, thus what you use to illuminate them should not matter at all

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