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from article Tomato
Tomato affected by anthracnose (caused by the fungus Colletotrichum phomoides). (Credit: U.S. Department of Agriculture Cooperative Extension Slide Series, Clemson University)
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Image
from article Tomato
Tomatoes showing blossom-end rot. (Credit: Mary Ann Hansen, Virginia Polytechnic Institute and State University)
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from article Ohmmeter
Electronic digital ohmmeter. (Tinsley)
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from article Ohmmeter
Diagram of ohmmeter, showing operating principles. C1, C2 = current terminals; P1, P2 = potential terminals.
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from article Ohmmeter
Special measuring probes (Kelvin clips), consisting of a set of leads with combined current probes (C1, C2) and potential probes (P1, P2).
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from article Cavity resonator
Closed-end sound pipe resonating (a) at the fundamental frequency f1 (the first harmonic) with wavelength λ1, and (b) at an overtone, f3 ≈ 3f1 (the third harmonic), with wavelength λ3.
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from article Cavity resonator
Wavemeters. (a) Wavemeter consisting of cylindrical cavity with an adjustable end-wall, resonating in the TE011 mode. The free-space wavelength λ0 corresponding to the resonant frequency f0 is given by λ0 = 2L[1 + (2L/1.64a)]− 1 2 . (b) Practical…
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from article Cavity resonator
Determination of the Q of a cavity resonator by (a) measuring the bandwidth and (b) measuring the damping rate of the oscillations.
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from article Lens (optics)
Refraction of light waves demonstrated by the disjointed appearance of a spoon entering a bowl of water, as well as the transposition of background colors due to the bowl's curvature. (Credit: Copyright © McGraw Hill)
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from article Lens (optics)
Illustration of a standard concave lens (left) that acts as a diverging lens and a standard convex lens (right) that acts as a converging lens.
