Which one of the following effects is not produced by interference?   a. Newton's rings   b. The spectrum of color seen using a prism   c. Iridescent feathers   d. The spectrum of color seen on a soap bubble

Q1. The air in a dark, smoky room often looks bluish when illuminated by white light. What creates this bluish appearance? (clue, Rayleigh scattering) Q2. A diamond pendant sparkles with color when you look at it in sunlight. From where do the colors come. (clue, dispersion) Q3. A thin layer of oil or gasoline floating on water appears brightly colored in sunlight. From where do the colors come (clue, Interference)

A laser illuminates a screen with two small holes drilled in it very close together. The lightemitted from the holes shines on a distant screen. What will be seen on the distant screen?a. A bright central dot surrounded by dimmer concentric circles.b. Two bright dots.c. A series of a few dots that are widely separated.d. A series of many dots that are very close together.

10. A ray of light with a wavelength of 480 nm strikes a very thin soap film of thickness 2.00 nm, with air on each side of the film. Which statement is true? a. There will be constructive interference because the path difference is effectively zero, and phase change occurs at only one surface. b. There will be destructive interference because the path difference is effectively zero, and phase change occurs at only one surface. c. There will be constructive interference because the path difference is effectively zero, and phase change occurs at either surface. d. There will be destructive interference because the path difference is effectively zero, and phase change does not occur at either surface.