A magnifying glass uses a convex lens with a refractive power of 20 diopters. What is the angular magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 5.0
B) 3.0
C) 4.0
D) 1.0
E) 2.0
A
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What do "forbidden" lines reveal about interstellar space?
A) The density or pressure of this gas is much lower than can be produced in a laboratory. B) The laws of physics are not the same in space as they are on Earth. C) There are unknown elements in space that do not correspond to elements found on Earth. D) There are molecules found in meteorites and interstellar dust that are not found on Earth. E) All of the above are true.
The study of planet Earth is known as
a. mineralogy. b. petrology. c. geology. d. paleontology.
The world's largest refracting telescope is operated at the Yerkes Observatory in Wisconsin. It has an objective of diameter of 1.02 m
Suppose such an instrument could be mounted on a spy satellite at an elevation of 300. km above the surface of the Earth. What is the minimum separation of two objects on the ground if their images are to be clearly resolved by this lens? (Assume an average wavelength of 0.55 ?m for white light.)
A total solar eclipse will only occur when the new moon is both on the ecliptic and at its greatest distance from Earth
Indicate whether the statement is true or false