You have a choice between two lenses of focal lengths fa and fb = 2 fa to use as objective lens in building a compound microscope. If the magnification you obtain using lens A is Ma, what will be the magnification when using lens B?
A) Mb = 2 Ma
B) Mb = 4 Ma
C) Mb = 8 Ma
D) Mb = Ma /4
E) Mb = Ma /2
E
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Indicate whether the statement is true or false
You may have heard it said that all objects, even ones at the temperature of our bodies, are continually emitting electromagnetic radiation. Is this true?
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a. results from a huge bar magnet within the planet. b. is believed to arise from currents within the planet's core. c. is always parallel to the planet's surface. d. is always in the same direction.