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
observed interference fringes from this combination shall be
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
observed interference fringes from this combination shall be
Updated On: Jun 14, 2022
- straight
- circular
- equally spaced
- having fringe spacing which increases as we go outwards
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The Correct Option is A
Solution and Explanation
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.
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.
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Concepts Used:
Young’s Double Slit Experiment
- Considering two waves interfering at point P, having different distances. Consider a monochromatic light source ‘S’ kept at a relevant distance from two slits namely S1 and S2. S is at equal distance from S1 and S2. SO, we can assume that S1 and S2 are two coherent sources derived from S.
- The light passes through these slits and falls on the screen that is kept at the distance D from both the slits S1 and S2. It is considered that d is the separation between both the slits. The S1 is opened, S2 is closed and the screen opposite to the S1 is closed, but the screen opposite to S2 is illuminating.
- Thus, an interference pattern takes place when both the slits S1 and S2 are open. When the slit separation ‘d ‘and the screen distance D are kept unchanged, to reach point P the light waves from slits S1 and S2 must travel at different distances. It implies that there is a path difference in the Young double-slit experiment between the two slits S1 and S2.
Read More: Young’s Double Slit Experiment