Two very flat pieces of glass touch at one edge and are held apart by a small wire at the other edge. Illumination from above by coherent light of wavelength 5000 angstroms results in 20 dark fringes between the touching surfaces and where the wire is located. The approximate diameter of the wire is
A) 200,000 angstroms.
B) 100,000 angstroms.
C) 50,000 angstroms.
D) 25,000 angstroms.

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The Answer of Two very flat pieces of glass touch at one edge and are held apart by a small wire at the other edge. Illumination from above by coherent light of wavelength 5000 angstroms results in 20 dark fringes between the touching surfaces and where the wire is located. The approximate diameter of the wire is
A) 200,000 angstroms.
B) 100,000 angstroms.
C) 50,000 angstroms.
D) 25,000 angstroms.

Two Very Flat Pieces of Glass Touch at One Edge