A Fabry-Perot interferometer is made from two parallel reflective metallic coating on an unknown small air size d. The device is illuminated glass, separated by of gap by a laser of wavelength 633nm and which produces a wide of range angles of incidence. On observing the transmitta function of angle, a series light as a of concentric thin bright circles. are a leas observed, with -wards, separated by a 4t measured that angula bright circle (labelled 1) has angu 5.41 deg from the axis, radius and the spacing decreasing out. dark regions. the smalles deg Calculate 12th bright circle (count= outwards) has angular radius 21.21 the size d of the
A Fabry-Perot interferometer is made from two parallel reflective metallic coating on an unknown small air size d. The device is illuminated glass, separated by of gap by a laser of wavelength 633nm and which produces a wide of range angles of incidence. On observing the transmitta function of angle, a series light as a of concentric thin bright circles. are a leas observed, with -wards, separated by a 4t measured that angula bright circle (labelled 1) has angu 5.41 deg from the axis, radius and the spacing decreasing out. dark regions. the smalles deg Calculate 12th bright circle (count= outwards) has angular radius 21.21 the size d of the
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