An optical fiber is made of clear plastic with index of refraction n = 1.57 . For what angles with the surface will light remain within the plastic "guide"?
a. ? < 32.5°
b. ? < 57.3°
c. ? < 39.6°
d. ? < 50.4°
e. ? < 68.7°
d
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Red dwarfs:
A) lie in the upper left of the Hertzsprung-Russell diagram. B) are the biggest stars in the main sequence. C) are cool and small with low luminosities. D) appear 1000 times larger than the Sun.
A muon behaves like an electron except that it has 207 times the mass of the electron. If a muon were bound to a proton, how would the energy levels in the Bohr model compare to those for a bound electron?
a. They would be the same. b. They would be (207)2 times as much as those for the electron. c. They would be 207 times as much as those for the electron. d. They would be (1/207) times as much as those for the electron.
Polarization of light can be achieved using a dichroic material like Polaroid by which of the following processes?
a. reflection b. double refraction c. selective absorption d. scattering
Which of the following best describes the image from a plane mirror?
a. virtual and magnification greater than one b. real and magnification less than one c. virtual and magnification equal to one d. real and magnification equal to one