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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Transcribed Image Text:E18 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?
Transcribed Image Text:(ii) If the refractive index of the glass
plates is 1.6 discuss the possibility of
using the above apparatus to deter-
mine the refractive indices of trans-
parent liquids in the range 1.2 to 1.6.
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