distanceBefore

Create an empty optical system.

opsys = opticalSystem;

To add a lens component to the optical system, create the two refractive surfaces of the lens using the addRefractiveSurface object function. Specify the lens glass material using the Material name-value argument for the first surface. Specify the center thickness of the lens, in millimeters, using the DistanceToNext name-value argument.

addRefractiveSurface(opsys,Radius=50,DistanceToNext=1.5,Material=pickGlass("N-BK7")) 
addRefractiveSurface(opsys,Radius=-50)

Add a gap using the addGap object function.

addGap(opsys,20)

Add a diaphragm using the addDiaphragm object function. Specify the diaphragm properties using the DistanceToNext and SemiDiameter name-value arguments.

addDiaphragm(opsys,DistanceToNext=28,SemiDiameter=2)

Add an image plane using the addImagePlane object function.

addImagePlane(opsys,SemiDiameter=2)

Display a 2-D visualization of the optical system using the view2d object function.

view2d(opsys,Labels="component")

ans = 
  OpticalSystemViewer2D with properties:

            Title: ""
    OpticalSystem: [1×1 opticalSystem]
           Labels: "component"
      FieldPoints: "on"
             Rays: [0×0 optics.ui.Rays2D]
           Parent: [1×1 Figure]

  Show all properties

Query the distance between the second and third components in the optical system using the distanceBefore object function. Specify the index of the third component to query the distance between it and the previous component.

dBefore = distanceBefore(opsys,3)

dBefore = 
28

Modify the distance between the second and third components in the optical system using the changeGap object function.

changeGap(opsys,3,7,GapLocation="before");

Query the new distance between the first and second components in the optical system using the distanceBefore object function.

dBefore = distanceBefore(opsys,2)

dBefore = 
20

Display the optical system in 2-D using the view2d function.

view2d(opsys,Labels="component")

ans = 
  OpticalSystemViewer2D with properties:

            Title: ""
    OpticalSystem: [1×1 opticalSystem]
           Labels: "component"
      FieldPoints: "on"
             Rays: [0×0 optics.ui.Rays2D]
           Parent: [1×1 Figure]

  Show all properties