An ideal Polaroid will transmit 50% of nonpolarized incident light. How much light is transmitted by two ideal Polaroids oriented with their axes parallel to each other?
A) 0%
B) 50%
C) 100%
D) between 0% and 50%
E) between 50% and 100%
Answer: B
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An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25. What is the critical angle for this fiber?
A. 63.2
B. 26.8
C. 41.8
D. 73.0
E. 16.5
Many classical Greek astronomers believed Earth could not move because they detected no parallax
a. True b. False Indicate whether the statement is true or false
Which of the following best explain what we think happened to outgassed water vapor on Venus?
A) Ultraviolet light split the water molecules, and the hydrogen then escaped to space. B) It turned into carbon dioxide by reacting with nitrogen in Venus's atmosphere. C) Water was removed from the atmosphere by chemical reactions with surface rock. D) It is frozen as water ice in craters near the poles.
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.