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A plate of glass 8.80 cm long is placed in contact
with a second plate and is held at a small angle
with it by a metal strip 8.60×10-2 mm thick
placed under one end. The space between the
plates is filled with air. The glass is illuminated
from above with light having a wavelength in air
of 618 nm.
Part A How many interference fringes are
observed per unit length in the reflected light?

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