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Hilaire's description was detailed. Let me just add a few things.
The most important tool I used was "locus" under the line tools submenu.
I recommend that you begin with drawing a parabola from its directrix:
This is not related to the lens, but it helps you understand the "locus" tool.
Since you are teaching this, I am sure you are familiar with
the construction of the image through a convex/concave lens:
Now consider the object (for example the circle
representing the head of my little stick man figure)
in front of the lens. If you pick a point on the object
as the independent (free) point, create its image
through the lens according to the optics laws,
and then tell Dr. Geo to create a locus (assigning
image point as the dependent point),
then the locus will be the image of the object.
You could further define this operation as a macro
so that it's easier to draw many more parts of the figure.
You could also apply the macro twice with respect
to two lens placed apart and get the effect of a
"two-convex lens telescope" (sorry I don't know its
correct name in English or in Chinese).
But as Hilaire said, it's not necessary to use a macro.
My example was made with the old version.
I do have a tutorial but it is in Chinese:
But I guess this is not very helpful even after
google translation :-)
Have fun with Dr. Geo!
校園P2P是否合法? 請搜尋『windows 10 打臉教育部』
Chao-Kuei Hung 洪朝貴
2015-09-12 21:42 GMT+08:00 Hilaire Fernandes <[hidden email]>:
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