A light ray goes through two thick rectangular slabs of glass, each of the same uniform thickness. The first slab has index of refraction n1 and the second n2 . If n1< n2. How does the original angle of incidence 
into the first slab compare to the final angle of refraction where the ray leaves the second slab going back into air?
A. 
B. 
C. 
D. 
E. more information is needed
C.
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 73 hours the star becomes significantly dimmer for about 2 hours. The most likely explanation is that
A) the star is a member of an eclipsing binary star system. B) the star is a Cepheid variable. C) the star is periodically ejecting gas into space, every 73 hours. D) the star is a white dwarf.
Name the four known fundamental forces in nature
What will be an ideal response?
A teaspoonful of white dwarf material on Earth would weigh
A) a few pounds. B) about the same as Mt. Everest. C) a few grams. D) a few tons. E) about the same as the Earth.
Mineral sample #4 is ________.
Sphalerite - ZnS Apatite - Ca5(PO4)3(F,Cl,OH) Goethite - ?-FeO(OH)