See Image Consider a diffraction pattern produced by a laser shining through two

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Consider a diffraction pattern produced by a laser shining through two slits separated by a distance d. Now suppose the slit-separation d is decreased a little, while everything else is kept fixed. In order to maintain the same pattern on the screen (i.e. with the same peak separation), which of the following statements is true? The wavelength of the light should be increased. The wavelength of the light should be decreased. The pattern didn't change when d changed, so nothing needs to be done. Changing the wavelength of the light cannot return the old pattern. None of the above are true. A single slit pattern is formed by shining a laser of wavelength lambda through a single slit onto a screen. The position on the screen of the first intensity minimum (to the side of the central maximum) is a little closer to one edge of the slit than to the other edge of the slit. How much closer is it to die nearer side of the slit? lambda/4 lambda/2 lambda 2 lambda None of the above

Explanation / Answer

1) b {Using formula lambda = 2dx / nD} 2)a {Using the same formula as mentioned above.} The minima is at lambda/4 and 3(lambda)/4 which gives closer one as lambda/4

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