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Choose the incorrect statement.

Options

  1. AThe fringe width in a Young's double slit experiment reduces when the width between the two slits increases.
  2. BThe central fringe observed for in a single slit diffraction experiment is a bright fringe.
  3. CThe resolving power of the microscope is reciprocal to the maximum separation of two points seen as distinct.
  4. DPolarisation phenomenon is observed only for transverse waves.

Correct answer

C. The resolving power of the microscope is reciprocal to the maximum separation of two points seen as distinct.

Step-by-step solution

(a) In Young's double slit experiment, the fringe width is given by = D d 1 d So, if width between two slit (d) increases, the fringe width reduces. (b) In diffraction due to single slit, the path difference between rays reaching centre of screen is zero, so its intensity at centre is maximum i.e., bright fringe is observed at centre. (c) The resolving power of microscope is = 1 d_ = 2 n 1.22 So, it is the reciprocal of the minimum separation (d_ ) of two points seen as distinct. (d) The polarisation is possible on

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