A ray of light travels across a liquid-to-glass interface. If the indices of refraction for the liquid and glass are, respectively, 1.63 and 1.43, what is the critical angle at this interface?
a. Critical angle does not exist.
b. 79.0°
c. 61.3°
d. 1.07°
e. 90°
c
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How does Newton's Universal Law of Gravitation explain Kepler's laws?
A) Universal gravitation implies that the orbits of the planets must be elliptical (Kepler's first law). B) Universal gravitation implies that the planets will sweep out equal areas in equal times (Kepler's second law). C) Universal gravitation implies that the planets further from the Sun will move more slowly than the planets closer to the Sun (Kepler's third law). D) Universal gravitation implies that when a planet is closer to the Sun in its orbit, it will move faster than when it is farther from the Sun (Kepler's second law). E) Both C and D are correct.
An object is placed 50 cm in front of a concave mirror with a focal length of 25 cm. What is the magnification?
A) -0.50 B) -1.0 C) -1.5 D) -2.0 E) -2.5
The sky is blue because of
a. interference. b. diffraction. c. scattering. d. dispersion. e. polarization.
Velocity Addition: From the Earth, the Earthlings see the Enterprise approaching from the west at 0.800c and the Klingons approaching from the east at 0.900c. What speed, in terms of the speed of light, does the crew of the Enterprise measure for the Klingon ship?
Fill in the blank(s) with the appropriate word(s).