171Optical fibers transmit light signals over long distances mainly by relying on what phenomenon?
172Total internal reflection occurs when light traveling in a denser medium strikes the boundary at an angle greater than what?
173Which part of the human ear vibrates in response to incoming sound waves?
174The decibel is a unit commonly used to express what property of sound?
175A classic bell-jar vacuum experiment demonstrates that sound cannot travel without what?
176A simple magnifying glass typically uses which type of lens to enlarge nearby objects?
177The distance between a lens or mirror and its focal point is generally called what?
178A real image formed by a convex lens, unlike a virtual image, can generally be what?
179A virtual image, such as the one formed by a plane mirror, generally cannot be what?
180An image formed by a plane mirror is typically described as being what, compared to the object?
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