resource recommendations - Software for geometrical optics

Is there any good software for construction optical path's in geometrical optics. More specifically I want features like:

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  draw $k \in \mathbb{N}$ objects $K_1,\dots,K_n$ with indices of refraction $n_1,\dots,n_k$ and light sources $l \in \mathbb{N}$ light sources $L_1,\dots,L_l$

  
  
  
  
  
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    define some light sources (or just light rays) and the program constructs the optical path of those rays through $K_1,\dots,K_n$.

    
    
  
  
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    define a point and the program constructs the optical path between the light sources and the given point

    
    
  
  
  
  


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  draw some specific optical elements like lenses, (concave, convex) mirrors and do things like above

  
  
  


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  construct automatically virtual images

  
  


• 3D drawings would be fine

I would prefer free software for linux.

Answer

The industrial tool is zemax; however, it is very expensive.

If you just want to make diagrams, the TeX package pst-optics might do the trick.

In the gaussian beam regime, optocad (free) is a tool often used in the laser interferometer gravitational wave detector community.