Convexconcavefunction

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concaveconvex中文

Refractive index is measured by a standard method.104 It covers transparent and light colored liquids having a refractive index in the range from 1.33 to 1.50.

Of the two broader sides one was concave, the other convex; while of the narrower sides one was flat and the other indented.

Consider the situation shown in Figure 2.37. The magnifying lens is held a distance ℓℓ from the eye, and the image produced by the magnifier forms a distance L from the eye. We want to calculate the angular magnification for any arbitrary L and ℓℓ. In the small-angle approximation, the angular size θimageθimage of the image is hi/Lhi/L. The angular size θobjectθobject of the object at the near point is θobject=ho/25cmθobject=ho/25cm. The angular magnification is then

concave翻译

Nov 13, 2015 — Eyepieces work in combination with microscope objectives to further magnify the intermediate image so that specimen details can be observed.

Log-concave

The concave metal strip starts higher under the heel, then swoops low under the forefoot before rounding up again under the toe, resulting in a springy ride that increases its rebound the harder you run.

Ellis's patent boot studs to save the sole, and the Euknemida, or concave-convex fastening springs, are the latest novelties.

From part (b) of the figure, we see that the absolute value of the image distance is |di|=L−ℓ|di|=L−ℓ. Note that di<0di<0 because the image is virtual, so we can dispense with the absolute value by explicitly inserting the minus sign: −di=L−ℓ−di=L−ℓ. Inserting this into Equation 2.28 gives us the final equation for the angular magnification of a magnifying lens:

Concavefunction

To account for the magnification of a magnifying lens, we compare the angle subtended by the image (created by the lens) with the angle subtended by the object (viewed with no lens), as shown in Figure 2.37. We assume that the object is situated at the near point of the eye, because this is the object distance at which the unaided eye can form the largest image on the retina. We will compare the magnified images created by a lens with this maximum image size for the unaided eye. The magnification of an image when observed by the eye is the angular magnification M, which is defined by the ratio of the angle θimageθimage subtended by the image to the angle θobjectθobject subtended by the object:

Diffraction gratings are used in optical systems to measure and separate wavelengths of light, as different wavelengths will diffract differently through the ...

The apparent size of an object perceived by the eye depends on the angle the object subtends from the eye. As shown in Figure 2.36, the object at A subtends a larger angle from the eye than when it is position at point B. Thus, the object at A forms a larger image on the retina (see OA′OA′) than when it is positioned at B (see OB′OB′). Thus, objects that subtend large angles from the eye appear larger because they form larger images on the retina.

Numerical aperture (NA) refers to the cone of light that is made from a focusing lens and describes the light gathering capability of the lens (similar to ...

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The resulting magnification is simply the ratio of the near-point distance to the focal length of the magnifying lens, so a lens with a shorter focal length gives a stronger magnification. Although this magnification is smaller by 1 than the magnification obtained with the image at the near point, it provides for the most comfortable viewing conditions, because the eye is relaxed when viewing a distant object.

Words related to concave are not direct synonyms, but are associated with the word concave. Browse related words to learn more about word associations.

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The Jones vector specifies the polarization state of the wave uniquely. It contains complete information about the amplitudes and the phases of the electric ...

Norland Optical Adhesive 68 (NOA68) is a clear, colourless, liquid photopolymer that will cure when exposed to ultraviolet light.

By comparing Equation 2.29 with Equation 2.32, we see that the range of angular magnification of a given converging lens is

concave中文

which shows that the greatest magnification occurs for the lens with the shortest focal length. In addition, when the image is at the near-point distance and the lens is held close to the eye (ℓ=0)(ℓ=0), then L=di=25cmL=di=25cm and Equation 2.27 becomes

Convex

We have seen that, when an object is placed within a focal length of a convex lens, its image is virtual, upright, and larger than the object (see part (b) of Figure 2.26). Thus, when such an image produced by a convex lens serves as the object for the eye, as shown in Figure 2.37, the image on the retina is enlarged, because the image produced by the lens subtends a larger angle in the eye than does the object. A convex lens used for this purpose is called a magnifying glass or a simple magnifier.

Note that all the quantities in this equation have to be expressed in centimeters. Often, we want the image to be at the near-point distance (L=25cmL=25cm) to get maximum magnification, and we hold the magnifying lens close to the eye (ℓ=0ℓ=0). In this case, Equation 2.29 gives

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where m is the linear magnification (Equation 2.32) derived for spherical mirrors and thin lenses. Another useful situation is when the image is at infinity (L=∞)(L=∞). Equation 2.29 then takes the form

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concaveconvex区别

Calculates the Area Under the ROC curve, and plots the ROC curve. Completely vectorized, very fast.

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The concave leather exterior gives your headphones and ear pads a safe and cozy place to sleep, and the cork feet prevent them from being knocked over.

Burin says a concave front could theoretically create a faster flow of water in the center, and it would also likely create more side-to-side stability.