Geometrical OpticsEasy
Question
A thin slice is cut out of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat plate as shown. The obseved interference fringes from this combination shall be
Options
A.straight
B.circular
C.equally spcaed
D.having fringe spacing with increases as we go outwards
Solution
Locus of equal path difference are the lines running parallel to the axis of the cylinder.
Hence, straight fringes are obtained.
Note : Circular rings (also called Newton′s rings) are observed in interference pattern when a plano-convex 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.
Hence, straight fringes are obtained.
Note : Circular rings (also called Newton′s rings) are observed in interference pattern when a plano-convex 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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