Read-only built-in example

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BRICKLAB · PARAXIAL OPTICS

Two-element classroom lens

Printed · λ 587.6 nm

Read-only built-in example Duplicate it to make changes in your browser.

System workspace

Object at infinity · image solved · 5 optical surfaces · λ 587.6 nm

Lens layout

Select a surface or ray, then use the visible ⋯ menu for actions
100% Drag background to pan · wheel to zoom
7 planes from OBJ to IMG. Solved image distance 11.6804 mm. Double-click a surface, or tab to it and press Enter, to quick edit.FF: -8.7049 mmHH: 13.1218 mmH′H′: 12.8538 mmF′F′: 34.6804 mmEPEP: 9.0891 mm · diameter 9.3925 mmXPXP: 7.9072 mm · diameter 11.5211 mmActual marginal: physical, launch y 4.6962 mm, u 0Actual chief: physical, launch y -0.7952 mm, u 0.08749Reverse trace from image (finds front focal point): reference, launch y 1 mm, u 0OBJ · z -18 mm · R plane · n′ 1 · semi-diameter 0 mm∞OBJS1 · z 0 mm · R 42.5 · n′ 1.5168 · semi-diameter 12.5 mm · clearance passes, margin 7.0086 mmS1: required 5.4914 mm; available 12.5 mm; margin 7.0086 mmS1S2 · z 6 mm · R -38.2 · n′ 1 · semi-diameter 12.5 mm · clearance passes, margin 7.6188 mmS2: required 4.8812 mm; available 12.5 mm; margin 7.6188 mmS2STO · z 10 mm · R plane · n′ 1 · semi-diameter 4 mm · clearance passes, margin 0 mmSTO: required 4 mm; available 4 mm; margin 0 mmSTOS4 · z 18 mm · R 31.6 · n′ 1.6727 · semi-diameter 10 mm · clearance passes, margin 6.1189 mmS4: required 3.8811 mm; available 10 mm; margin 6.1189 mmS4S5 · z 23 mm · R -52.1 · n′ 1 · semi-diameter 10 mm · clearance passes, margin 6.4103 mmS5: required 3.5897 mm; available 10 mm; margin 6.4103 mmS5IMG · z 34.6804 mm · R plane · n′ 1 · semi-diameter 14 mm11.68 mmIMG · SOLVED10 mmImage real · dashed: reverse/reference · dotted: virtual extension
Ray directions and scale

The marginal ray starts on axis; the chief ray represents the requested field and passes through the aperture-stop center. They describe different object points. The blue reverse reference starts at image-space infinity and finds the front focus, independently of the object.

Drag a surface to change its preceding gap, or a selected aperture handle to change its semi-diameter. Small, slow motions are finer; longer, faster motions increase sensitivity. Hold Shift for tenfold precision. Release to apply one edit; Escape or a canceled pointer restores the starting value. Use arrow keys on a focused surface or aperture, or double-click a surface for numeric entry.

Axial and height scales differ in this schematic. The pixel angle is not the physical angle. Incident chief slope u = 0.087489; angle = 5°.

Prescription quick start

Enter surfaces and spaces below. The image plane, results, layout, and Brick Sheet update automatically.

#LabelTypeRadius / focal value (mm)Surface bendSpace to next (mm)Index afterSemi-diameter (mm)Actions
0
│—
∞OBJECT
1
(R > 0
nd 1.51680 · Vd 64.17
2
)R < 0
3
║aperture
4
(R > 0
5
)R < 0
11.68043SOLVE
6
│—