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(a) What is the spacing of the dark fringes in an interference pattern reflected from an air wedge between two microscope slides 10 cm long,

(a) What is the spacing of the dark fringes in an interference pattern reflected from an air wedge between two microscope slides 10 cm long, separated at one end by a paper of thickness 0.10 mm, illuminated with red light of wavelength 660 nm? (b) How would the spacing change if the wedge were filled with water (refractive index = 1.33)?

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