Ideal Lens
Use the Ideal Lens boundary condition to treat a surface as if it were a lens, without having to create a detailed lens geometry.
The selected boundary or boundaries for the Ideal Lens should generally be a planar surface (in 3D) or a straight edge (in 2D).
Device Properties
Select an option from the Ideal lens type list: Paraxial surface (the default), Thin lens, or Thick lens.
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If Paraxial surface is selected, choose one of the following from the Paraxial surface type list:
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Specify effective focal length (the default): enter a value or expression for the Effective focal length feff (SI unit: m). The default is 100 mm.
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Specify optical power: enter a value or expression for the Optical power K (SI unit: 1/m). The default is 0.1 m-1.
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If Thin lens is selected, enter the following:
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Radius of curvature, surface 1 R1 (SI unit: m). The default is 100 mm. This value should be positive for a convex surface or negative for a concave surface.
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Radius of curvature, surface 2 R2 (SI unit: m). The default is 100 mm. This value should be negative for a convex surface or positive for a concave surface.
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Refractive index n (dimensionless). The default is 1.5.
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If Thick lens is selected, enter the same parameters as for Thin lens, plus the additional Center thickness Tc (SI unit: m). The default is 0.
Ideal Lens Reference
The ideal lens reference is the pole of the ideal lens. A rays passing through this point will be undeviated. The Ideal lens reference can be selected from a number of options.
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Centroid of selection will compute the geometric center of all selected boundaries.
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From coordinates will give a point on the ideal lens that is a projection of a user defined point onto a plane containing the ideal lens surface.
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Selected point will use the point indicated in the Reference Point Selection section.
See Wall for information on the section New Value of Auxiliary Dependent Variables.
Ideal Lens Theory