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A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat glass plate as shown in figure. The observed interference fringes from this combination shall be

Options

  1. Astraight
  2. Bcircular
  3. Cequally spaced
  4. Dhaving fringe spacing which increases as we go outwards

Correct answer

A. straight

Step-by-step solution

Locus of equal path difference are lines running parallel to the axis of the cylinder. Hence, straight fringes will be observed. Note: Circular rings (also called Newton's rings) are observed in interference pattern when a planoconvex lens of large focal length is placed with its convex surface in contact with a plane glass plate because locus of equal path difference in this case is a circle.

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