It is not the intention of this chapter to study lens aberrations. However, the design of an achromatic doublet lens lends itself to the sort of calculation we are doing in this chapter.

R Paschotta · 3 — The focal length is the distance from the lens to that focus (assuming that the lens is surrounded by vacuum or air, not by some dense substance with a ...

achromatic中文

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Doubletlens

INP-FNE is optimized for ultra short throw projectors. According to the priciple of Fresnel lens, it can reflect the incident light from the screen to the ...

Here C, D and F refer to the wavelengths of the C, D and F Fraunhofer lines in the solar spectrum, which are respectively, H\(\alpha\) (656.3 nm), Na I (589.3 nm), H\(\beta\) (486.1 nm), and which may be loosely referred to as “red”, “yellow” and “blue”. A typical value for a crown glass would be about 0.016, and a typical value for a flint glass would be about 0.028.

Opticallens

Now, making use of equations \(\ref{eq:2.10.1}\) and \(\ref{eq:2.10.6a,b}\), we obtain the condition that the powers will be the same in red and blue:

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Convexlens

Then I thought, wouldn't this mean that a prism would break a green laser into yellow and blue? A quick search confirmed this is obviously not the case since laser light is a single wavelength, not an additive combination of primaries...

Suppose that, instead of making the crown lens equibiconvex, you elect to make the last surface flat – i.e. \(c\) = ∞. What, then, must \(a\) and \(b\) be?

This page titled 2.10: Designing an Achromatic Doublet is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Jeremy Tatum via source content that was edited to the style and standards of the LibreTexts platform.

If we want to make the first lens equibiconvex, so that \(a = b\), and if \(n_1 = 1.5\), Equation \(\ref{eq:2.10.2}\) tells us that \(a\) = 6.86 cm. If \(n_2 = 1.6\), Equation \(\ref{eq:2.10.3}\) then tells us that \(c = −144\) cm. That \(c\) is negative tells us that our assumption that the flint lens was concave to the right was wrong; it is convex to the right.

You see a similar thing if you use a 405 nm (almost invisible, near UV) laser pointer and shine it at a piece of white paper. The paper contains compounds that fluoresce, and the resulting beam suddenly goes from "barely visible purple" to "bright blue".

Relaylens

At first I thought about it and reasoned that green=(yellow + blue) hits the ball which reflects orange=(yellow + red) thus yellow is reflected.

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I Carusotto · 2000 · 11 — We consider the dynamical Bragg reflection of an atomic matter wave from a finite optical lattice; the resulting energy dependence of the ...

For example, suppose that we want the focal length in yellow to be 16 cm ( \(P^{(D)}= 0.0625\) cm-1) and that the dispersive powers are 0.016 and 0.028. Equations \(\ref{eq:2.10.8}\) and \(\ref{eq:2.10.11}\) then tell us that we must have \( P_1^{(D)}= 0.14583\) cm-1 \) and \(P_2^{(D)}= -0.083\) cm-1. (\(f_1 =6.86\) cm and \(f_2 = -12.0\) cm).

Crea un'atmosfera magica e avventurosa nella cameretta del tuo bambino con la Veglia notturna Nuvoletta Spazio. Questa dolce lampada proietta un cielo di stelle ...

Telephotolens

R Pasnau · 1999 · 66 — ... illumination. A vivid example of the way Aquinas moves from an Augustinian to an Aristotelian framework occurs in his Treatise on Human ...

An achromatic doublet is typically made of a positive crown glass lens whose power is positive but which decreases with increasing wavelength (i.e. toward the red), cemented to a weaker flint glass lens whose power is negative and also decreases (in magnitude) with increasing wavelength. The sum of the two powers is positive, and varies little with wavelength, going through a shallow minimum. Typically, in designing an achromatic doublet, there will be two requirements to be satisfied: 1. The power or focal length in yellow will be specified, and 2. You would like the power in red to be the same as the power in blue, and to vary little in between.

Asphericallens

A combination of two lenses in contact, a converging lens made of crown glass and a weaker diverging lens made of flint glass, can be designed so that the combination is a converging lens that is almost achromatic. Flint glass is a little denser than crown glass, and has a higher refractive index and a greater dispersive power.

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The other is that the total power in the red is to equal the total power in the blue, and I now make use of equations \(\ref{eq:2.10.5a,b}\) and \(\ref{eq:2.10.7a,b}\):

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I have indicated the indices and the radii of curvature. The power (reciprocal of the focal length) of the first lens by itself is

Apochromaticlens

As the green light has a shorter wavelength (higher energy) than the emission wavelength of the phosphor, you excite the phosphor in the ball - and it then emits the longer wavelength of light.

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I hypothesize that your orange pingpong ball is fluorescent (this is often done to make the ball more visible: see this article for more details. As that article mentions, white balls are used in tournaments, where the table, floor and clothing are dark-colored, lighting is sufficient, and white will provide better contrast).

□ STW-2FF-5 (50 mm F/F connector). □ STW-2MM-5 (50 mm M/M connector). □ STW ... .47in. 12.00mm. DESIGNATED CUT LINES. 1.61in. 40.89mm .67in. 16.89mm. 0.20in.

Laser light from a green laser pointer is essentially monochromatic. I demonstrated that in this earlier answer which shows how to measure the wavelength - in the process of that experiment you see the spectrum consists of a single peak.