A light ray enters a glass enclosed fishtank. From air it enters the glass at 20.° with respect to the surface, then emerges into the water. The index for glass is 1.50 and for water 1.33
(a) What is the angle of refraction in the glass?
(b) What is the angle of refraction in the water?
(c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection?
(a) 39.°
(b) 45.°
(c) no
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________ provides experimental evidence that the Universe is expanding.
A. Dark matter B. Hubble's law C. The Big Bang model D. The cosmological constant
Instructions: On occasion, the notation 
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Given that 
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A.
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Ptolemy was important in the history of astronomy because he ________
A) was the first to believe that all orbits are perfect circles B) was the first to create a model of the solar system that placed the Sun rather than the Earth at the center C) developed the first scientific model of the universe D) developed a model of the solar system that made sufficiently accurate predictions of planetary positions to remain in use for many centuries
As a helium-filled balloon rises in the air, it becomes
A) bigger. B) more dense. C) heavier. D) all of the above E) none of the above