A simple compound microscope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece.
B) a short focal length objective and a long focal length eyepiece.
C) a long focal length objective and a short focal length eyepiece.
D) a long focal length objective and a long focal length eyepiece.
B
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The electrical force between charges is strongest when the charges are
A) close together. B) far apart. C) either of these D) need more information
A line perpendicular to a surface or curve _________
Fill in the blank(s) with the appropriate word(s).
A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength is doubled?
A) It will be cut to one-quarter its original size. B) It will be cut in half. C) It will double. D) It will become four times as large. E) It will become eight times as large.
Which of the following objects is not a close approximation of a thermal emitter?
A) hot, thin gas B) a star C) a filament in a light bulb D) you E) a planet