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Part 3. Add a Lens

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Next, we add a lens to the cavity. When adding new optics, we need to select the optic directly preceding the segment where the new optics should be added. In some special cases, not all types of optics can be added.

• Select the left-hand mirror. Notice how the centreline of the cavity—the segment between the two mirrors—is highlighted.

• Select menu Edit | Insert | Insert Lens, or click the  Insert Lens button on the toolbar.

The new lens is created with a default focal length of f = 500 mm, centred between the mirrors. The lens and the following segment are automatically selected, so we could add more optics by repeating the Insert command.

• 
  In the Property Manager, click the Focal Length field, and enter 200. The lens now has a focal length of f = 200 mm.
• Grab the lens by clicking at the centreline, and drag it around.

Unlike mirrors, lenses can only be moved along the section between two mirrors. This is also true for other type of optics, such as crystals.

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