A 35-Cm-Long Microscope Glass Slide Has One Edge in Contact with with a Flat

question 139

Multiple Choice

A 3.5-cm-long microscope glass slide has one edge in contact with a flat plane of glass, while the other edge is slightly raised due to the insertion of a thin piece of paper. Sodium light of wavelength 589 nm is normally incident on the glass from above and interference fringes are observed by reflection with a regular spacing of 0.22 mm. Calculate the thickness of the piece of paper.

• A) 9.4 × 10^-5 m
• B) 5.5 × 10^-5 m
• C) 2.4 × 10^-5 m
• D) 4.7 × 10^-5 m
• E) None of these is correct.

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