Question
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Imagine a diffraction grating consisting of 10 slits, each separated by the same distance of 1.5 mu m, illuminated with monochromatic light of wavelength 633 nm. Explain why the directions ( theta ) in which the maxima in intensity are observed are given by d sin theta = m lambda , using the idea of path length difference, Find the direction ( theta ) in which the first order maximum in intensity will be found (m = 1). Consider a small change in angle delta theta = 1.0 degree from the theta value you calculated in part (ii). Calculate the path length difference for the waves leaving 1st slit and the 2nd slit, and also for the waves leaving 1st slit and the 10th slit. Compare these path length differences in terms of lambda, and explain why destructive interference occurs over a much larger angular region for a diffraction grating that for the case of just two slits.
Explanation / Answer
You are offering very few points for such a length question
