2. Solved Papers
  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2001

  • question_answer
    A parallel beam of monochromatic light is incident normally on a slit. The diffraction pattern is observed on a screen placed at the focal plane of a convex lens. If the slit width is increased, the central maximum of the diffraction pattern will:

    A)  become broader and fainter

    B)  become broader and brighter

    C)  become narrower and fainter

    D)  become narrower and brighter

    E)  remain unchanged

    Correct Answer: D

    Solution :

    Width of central maximum \[\beta =\frac{D\lambda }{d},\]d being slit width. If the slit width is increased the central maximum becomes narrower and more light reaches the region.


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