When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
[Ques. 2] Thin film interference is responsible for the colors of
a. bird feathers c. soap bubbles
b. gasoline spills d. all of the above
[Ques. 3] Light spreads out when it passes through a narrow slit because of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
[Ques. 4] A helium neon laser generates light of 632.8 nm wavelength. What color is that?
a. blue c. red
b. yellow d. green
[Ques. 5] The colors of objects we see by reflected light are due to
a. interference c. specular reflection
b. selective absorption d. diffuse reflection
[Ques. 6] Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can.
b. Light goes faster than electricity.
c. They carry digital information. Wires can't carry digital information.
d. all of the above
[Ques. 7] Liquid crystal displays make use of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
[Ques. 8] What is meant by the normal to a surface?
a. a line perpendicular to the surface at a given point
b. the angle between the surface and the light ray
c. a line parallel to the surface at a given point
d. the direction of a reflected ray
[Ques. 9] You do not see your image when you look at a flat rough aluminum surface because of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
[Ques. 10] You can see your image in a mirror because of
a. interference
b. diffraction
c. specular reflection
d. diffuse reflection
e. polarization
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