a) White light is usually incident on two glass microscope slides with a thin layer of air of variable thickness among the slides, as seen in the figure below. Which wavelengths interfere constructively when reflected at a point where the air layer is 830 nm thick? (Give the answer as a comma separated list. Round your answer to the nearest whole number.)
b) Compute Brewster's angle for light incident from diamond into air if the glass has an index of 2.409.