18 A wedge-shaped film of air is formed between two thin parallel-sided optically flat glass plates as shown in the diagram below. Straight wire parallel to edge of plate inot to scalel 5.0 cm When the film is illuminated from above using monochromatic light of wavelength 550 nm a series of bright and dark fringes is observed. (a) Sketch the fringes and explain their formation, without calculation. (b) Calculate the distance between adjacent bright fringes when viewed from above for a wire of 0.05 mm diameter. (c) The wedge-shaped space between the plates is now filled with a transparent liquid of refractive index 1.2. (1) What would be the new distance between alternate bright fringes?
18 A wedge-shaped film of air is formed between two thin parallel-sided optically flat glass plates as shown in the diagram below. Straight wire parallel to edge of plate inot to scalel 5.0 cm When the film is illuminated from above using monochromatic light of wavelength 550 nm a series of bright and dark fringes is observed. (a) Sketch the fringes and explain their formation, without calculation. (b) Calculate the distance between adjacent bright fringes when viewed from above for a wire of 0.05 mm diameter. (c) The wedge-shaped space between the plates is now filled with a transparent liquid of refractive index 1.2. (1) What would be the new distance between alternate bright fringes?
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