15. A glass slide (ng-1.50) of length 3 cm touches a flat plate of sapphire (n-1.77) on one side and is raised by a wire on the other end, forming an air wedge (Fig. B15). glass wire Sapphire Fig. BIS (a) The setup is illuminated by a monochromatic light of wavelength 590 mm, leading to interference fringes. (1) Determine whether a bright or dark fringe is observed on the side where the slide touches the sapphire plate. Explain briefly. (ii) Adjacent bright fringes are separated by 450 um as measured along the surface of the glass slide. Determine the diameter of the wire.
15. A glass slide (ng-1.50) of length 3 cm touches a flat plate of sapphire (n-1.77) on one side and is raised by a wire on the other end, forming an air wedge (Fig. B15). glass wire Sapphire Fig. BIS (a) The setup is illuminated by a monochromatic light of wavelength 590 mm, leading to interference fringes. (1) Determine whether a bright or dark fringe is observed on the side where the slide touches the sapphire plate. Explain briefly. (ii) Adjacent bright fringes are separated by 450 um as measured along the surface of the glass slide. Determine the diameter of the wire.
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Transcribed Image Text:15. A glass slide (ng=1.50) of length 3 cm touches a flat plate of sapphire (n. = 1.77) on one
side and is raised by a wire on the other end, forming an air wedge (Fig. B15).
glass
wire
Sapphire
Fig. B15
The setup is illuminated by a monochromatic light of wavelength 590 nm, leading
to interference fringes.
(1) Determine whether a bright or dark fringe is observed on the side where the
slide touches the sapphire plate. Explain briefly.
(ii) Adjacent bright fringes are separated by 450 µm as measured along the
surface of the glass slide. Determine the diameter of the wire.
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