Two narrow, parallel slits separated by 0.850 mm are illuminated by 570-nm light, and the viewing screen is 2.60 m away from the slits. (a) What is the phase difference between the two interfering waves on a screen at a point 2.50 mm from the central bright fringe? rad (b) What is the ratio of the intensity at this point to the intensity at the center of a bright fringe? I 0.9938 X Imax Can you use the small-angle approximation in this problem? Two narrow, parallel slits separated by 0.850 mm are illuminated by 570-nm light, and the viewing screen is 2.60 m away from the slits. (a) What is the phase difference between the two interfering waves on a screen at a point 2.50 mm from the central bright fringe? rad Imax You appear to have correctly calculated this result using your incorrect value of the phase difference from part (a). (b) What is the ratio of the intensity at this point to the intensity at the center of a bright fringe? I = 0.0443 X

Question A2 Red light of vacuum wavelength 650 nm is travelling in a non-magnetic dielectric glass of refrac- tive index ng = 1.60. Calculate the impedance of the glass, the wavelength of light in the glass, and the critical angle 0c for total internal reflection at a glass-air interface. Question A3 Light is incident from air onto a horizontal surface of water of refractive index nw = 1.33. Calculate the Brewster angle at which the reflectance for the TM polarisation is zero. Also, cal- culate the power reflection coefficient RTE for TE-polarised light incident at this Brewster angle.

A double-slit arrangement produces interference fringes that have an angular separation of 5.14 × 10-3 rad for light with a wavelength of A = 429 nm. For what wavelength would the angular separation be 14.6% greater? Number i Units

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