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. 2] Liquid crystal displays make use of
a. interference.
b. diffraction.
c. specular reflection.
d. diffuse reflection.
e. polarization.
[Ques. 3] 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. 4] 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. 5] You can see your image in a mirror because of
a. interference.
b. diffraction.
c. specular reflection.
d. diffuse reflection.
e. polarization.
[Ques. 6] In order to see a rainbow, the Sun must be directly in front of you.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 7] The sky is blue due to air molecules scattering sunlight in all directions.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 8] The speed of light in any transparent medium is the same as the speed of light in a vacuum.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 9] LCDs operate on the principle of refraction through glass.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 10] A magnifying glass with focal length 15 cm is placed 10 cm above a stamp. The image of the stamp is located 30 cm above the magnifying glass.
a. True
b. False
Indicate whether the statement is true or false
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