The principal refraction of light by the eye occurs at the
A) cornea.
B) lens.
C) sclera.
D) iris.
E) retina.
A
You might also like to view...
A string fixed at both ends is vibrating in its 8th harmonic
(a) How many nodes are on the string? (b) The 8th harmonic wavelength is what fraction of the string length? (c) If the 8th harmonic frequency is 976. Hz, what is the frequency of the 2nd overtone?
In a ballistics test, a bullet moving horizontally with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm
(a) What is the magnitude of the average acceleration of the bullet in the sandbag? (b) How many milliseconds does it take the bullet to come to rest in the sandbag?
In years of heavy snow pack in the mountains it is sometimes desirable to induce early melting of the snow, rather than wait until it all melts suddenly and causes floods
It has been suggested that a way to accomplish this might be to have planes fly over the snow fields and sprinkle them with black soot. What do you think of this idea? Would it work? A) Yes, it would probably work because the black surface would be a better absorber of sunlight than would the white snow. B) Yes, it would work because the soot would raise the melting point of the snow. C) Yes, it would work because the soot would decrease the specific heat capacity of the snow. D) No, it would not work because it is infrared radiation and not visible radiation which melts the snow. E) No, it would not work because sunlight has very little effect on how fast the snow melts.
A spring is stretched 10 cm by a suspended 1-kg block. If two such springs side-by-side are used to suspend the 1-kg block, each spring will then stretch
A) 5 cm. B) 10 cm. C) 20 cm. D) 30 cm. E) none of the above