Gratingdispersion

The magnification of the eyepiece is inversely proportional to its length, while the magnification of the objective lens is directly proportional to its length.

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The E140M grating is used with the FUV-MAMA and provides echelle spectra at a resolving power of 45,800 from ~1144–1729 Å.

Diffractiongrating

Eyepiece: Installed at the upper end of the lens barrel, usually with 2-3 pieces, engraved with symbols of 5 ×, 10 ×, or 15 × to indicate its magnification, usually equipped with a 10 × eyepiece Objective lens: Installed on the rotator at the lower end of the lens barrel, there are usually 3-4 objective lenses, among which the shortest one engraved with the "10 ×" symbol is the low magnification lens, the longer one engraved with the "40 ×" symbol is the high magnification lens, and the longest one engraved with the "100 ×" symbol is the oil lens. In addition, a circle of different colored lines is often added to distinguish between the high magnification lens and the oil lens

Echellevs echelettegrating

Roughness profile. The profile derived from the primary profile by suppressing the long wave component using the high-pass filter with a cutoff value of λc. The ...

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Point source sensitivity assumes full transmission (zero slit losses). Diffuse source sensitivity assumes a 0.1" wide slit. To convert point source sensitivities to diffuse source sensitivities multiply the point source values by the grating spatial (cross dispersion) plate scale in units of arcseconds per pixel and by the width of the desired slit in units of arcseconds.

Echelle gratingpdf

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Échelle meaning

The objective lens is equivalent to the lens of a projector, and objects are inverted and magnified into a real image through the objective lens; The eyepiece is equivalent to a regular magnifying glass, and the real image formed by the objective lens is then transformed into an upright and magnified virtual image through the eyepiece

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1. The function of the eyepiece of an optical microscope It is to further enlarge the real image that has been magnified by the objective lens and has a clear resolution, to the extent that the human eye can easily distinguish it.

Newportechelle Grating

A single E140M echellogram covers ~600 Å, however at wavelengths longward of 1649 Å, the echelle orders overrun the width of the detector in the dispersion direction, so there will be three small gaps in the wavelength coverage. One gap of ~0.2 Å, one of ~0.4 Å, and one of ~0.7 Å occur between 1649 and 1700 Å.

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The difference between eyepiece and objective lens in optical microscope The eyepiece and objective of a microscope are both convex lenses, with the difference being that the focal length of the eyepiece is shorter,

The 50% and 10% points for MTF are now 36.8 and 68.6 line pairs/mm. This is the best that can be expected for an excellent lens covering 43mm diagonal, optimum ...

Also note that while the spectral format of the E140M extends down to 1123 Å, HST's total system throughput is extremely small below about 1144 Å.

Echelle gratingspectrometer

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2. The relationship between the eyepiece and objective lens of an optical microscope. The objective lens has already distinguished the fine structures clearly. If it is not magnified by the eyepiece, it cannot reach the size that the human eye can distinguish, and then it cannot be seen clearly; However, fine structures that cannot be distinguished by the objective lens cannot be seen clearly even after being magnified by a high-power eyepiece. Therefore, the eyepiece can only serve as a magnifying lens and will not improve the resolution of the microscope. Sometimes, although the objective lens can distinguish two objects that are very close together, the distance between the images of these two objects is smaller than the resolution distance of the eye, so it is still difficult to see clearly. So, the eyepiece and objective lens are both interrelated and mutually restrictive.

The top axis displays constant Fλ values corresponding to the STMAG units (V+STMAGλ) on the bottom axis. Recall that STMAG=0 is equivalent to Fλ = 3.63E–9 erg/cm2/s/Å. The curves are labeled with exposure times in seconds.