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Shareware Overload Trio 2
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Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
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1993-09-10
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Let's take a look at those two wavefronts side by side. Remember
that these calculated wavefronts do not actually exist. Rather, they
have been back-calculated from single point images. That is, if
that single pixel were lit by light going the opposite direction from
the way it will actually go, this is the kind of wavefronts that would
be projected onto the two sides of the transistor. We will use these
calculations to produce holograms that actually will focus light going
in the correct direction onto those points. This works because the
actual calculations used do not include direction parameters. Thus
the calculated results will be the same. The calculation is basically
just a 3D pythagoras in wavelength units.
So let's look at them together. You will see from the circular
nature of the waves how such would result from light projected from a
point directly in front of the screen at the calculated focal distance.