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General
Easy
Question
An observer looks down on two glass plates, one placed on top of the other. The top plate pivots about a line of contact at its edge as shown in the figure. The angle created by the pivoting motion increases in time. Which is true?
- The entire plate surface alternates between dark and bright as time advances
- The width of alternating bright and dark fringes aligned parallel to the line of contact increases with time.
- The width of alternating bright and dark fringes aligned parallel to the line of contact decreases with time.
- The width of alternating bright and dark fringes aligned perpendicular to the line of contact of constant in time, but become blurrier as time advances.
The correct answer is: The width of alternating bright and dark fringes aligned parallel to the line of contact decreases with time.
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