A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed. What is the thickness of the thread?
A) 22.3 μm
B) 26.7 μm
C) 32.3 μm
D) 53.3 μm
E) 76.3 μm

Question

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The Answer of A very fine thread is placed between two glass plates on one side and the other side is touching to form a wedge. A beam of monochromatic light of wavelength 600 nm illuminates the wedge and 178 bright fringes are observed. What is the thickness of the thread?
A) 22.3 μm
B) 26.7 μm
C) 32.3 μm
D) 53.3 μm
E) 76.3 μm

A Very Fine Thread Is Placed Between Two Glass Plates