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computation pages are accessible through the menu in the left column. Each theme is linked to a page of sub-topics associated with a list of titles. Selecting a title redirect the user either on a computation page or a short list displaying titles, resumes and eventually schemes of concerned computation pages.

Some calculations are free and some other request a paying subscription. For free computation pages, the "free" comment is displayed at the end of the title.

Obtaining result(s) from a pay page requests first that the user has logged in (by clicking on the "log in" link). However, a pay computation page can be opened even if the user is not logged in. By this way an internaute can exactly know the whole service proposed before subscribing.

Thematic tutorial lists are displayed when clicking in the "tutorials" link. Tutorials are not complete courses about the concerned theme but give basic information for using computation pages. A glossary ("glossary" link) with main of the words and expressions used in the computation pages is also available.

computation pages

Whatever free or not, there are two types of computation pages.

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The first type displays "input" and "output" tables. It is necessary to fill in all input cells for obtaining the result(s) corresponding to output parameter(s).

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In the second type, only one "parameter" table is displayed. The user has to choose the parameter to be calculated and then fill in all the other cells. The result page will display an "input" table with the corresponding entered values and an "output" table with the result.

Whatever the type of page, all parameters units ( input and output parameters) have to be primarily chosen by the user.

For decimal numbers, both comas and dots are accepted.

After calculations, all values are displayed in scientific format.

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Most of computation pages contain a scheme which can be enlarged by clicking on it.
They also have a "more details…" link connecting to the concerned tutorial.

Using the glass catalog and choosing wavelengths

In some computation pages, the refraction index is an input parameter. Instead of enterring a number, the user can enter a glass reference from the catalog. If the wavelength is not an input parameter of the concerned page, the calculation uses the refraction index of the selected reference at a default wavelength. Initially, the default wavelength is 0.55 µm. However, the user can modify it by clicking on the wavelengths link in the left column and enterring a new value in the lam cell.

When the wavelength is an input parameter of the concerned page, the calculation uses the refraction index at the enterred wavelength and this wavelength is also registered as the new default wavelength.

For chromatism calculation, instead of enterring the refraction indexes of a medium corresponding to the smallest and the largest wavelengths of the considered spectrum, the user can also enter a glass reference from the catalog. By default, the low wavelength is 0.48613 µm and the large wavelength is 0.65627 µm. However, the user can modify them by clicking on the wavelengths link in the left column and enterring new values in the lam_min and lam_max cells.
It is necessary that lam_min < lam < lam_max, however an error message is displayed.

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