Science of Light
As can be seen from this graph, visible light takes
up a very minor proportion of the elctro-magnetic spectrum.
The slower sound waves are shown at the right in this
diagram, with increasing rates of vibration as one moves
toward the left, toward light and beyond.
Light is the form of radiant energy that
stimulates the organs of sight.
The part of this range that is visible to the human
eye consists of wavelengths extending from about 3900
angstroms to 7700 angstroms, and traveling at a speed of
about 186,000 miles per second.
These waves of energy become visible because
electromagnetic waves in this range excite certain nerve
endings in the retina of the eye.
Impulses are transmitted to the brain by these
nerves, where they give rise to sensations of light and
Color has been termed “a visual attribute of
substances whose wave lengths of radiant energy are capable
of stimulating the retina.”
All color sensations are caused by light rays
entering our eyes, whether these stem from the sun, a flame,
a lamp, or other glowing substance.
But it must be
remembered that the eyes do not see; what you see is in the
All other objects are seen by reflected light, and
the colors which they show exist in the light and not in the
objects we see as colored do not add anything to the light
which falls upon them before reflecting it forth, but
subtract or absorb something from that light.
The apparent color of an opaque object depends upon
the quality of light which falls upon it.
Substances have a tendency, depending on their
chemical structure, to absorb certain wave-lengths of light,
and to reflect or transmit the others.
The absorbed waves are turned into heat or some other
form of energy. White
substances reflect all wave-lengths of light equally; black
substances absorb all, or nearly all of them, and reflect
relatively little light.
A colored object is one that reflects some colors,
but not others, so any object appears only the color of the
five, page 2
White being a mixture of all the colors, a white
object is one that reflects all colors about equally, and so
it looks colored only if it is illuminated by a colored
When two paints of different colors are mixed
together, the appearance may become less bright, because the
resulting color will be that which they can both reflect.
If the same two colors (as the paint) of light rays
are blended together the combination of rays may appear
quite different, in that they are not reflective.
Visual judgments of color are very rough.
They tell only the predominant behavior at the
surface of an opaque object.
In fact, appearances of all kinds are relatively
the eye, ordinary matter appears to be continuous,
presenting an unbroken surface, but science tells us it is
not. If we had
ultramicroscopic vision we might see through many things
which now appear quite solid, and the smooth tops of tables
would be made of mountains and valleys.
We might even see the sunlight in cucumbers which the
philosophers of a certain country, we are told, were trying
If the eye could see in the ultra-violet region of
the spectrum, substances which emit ultra-violet would
appear to be surrounded by an aura or halo.
Human bodies would be seen surrounded by some sort of
penumbra visible now to those who claim clairvoyance.
We see that the world as it appears to us is largely
a product of our sensory equipment.
Professor Reiser also states that we have developed
the faculty of vision through the need, or the great desire,
Maxwell, in the nineteenth century, defined light as
part of a vast continuous spectrum of electromagnetic
is also distinguished by the fact that the eye is sensitive
to it. However,
it only becomes visible by virtue of the objects of dense
matter and of the earth itself which deflect light rays, for
if there was nothing material to absorb the rays, they would
flow right past and one would not see them; all would appear
blackness, except the sun.
The eye is an image-catching device.
The process of vision in all creatures begins with
light entering the eye and bringing with it the information
is has picked up in touching or passing through the objects
in its path. These
light patterns travel through the various parts of the eye
until the image is cast upon the back wall, or retina of the
eye, just as a picture is thrown upon film by a camera.
It is important that there be neither too much nor
too little light for a clear image.
It is the work of the iris, the colored part of the
eye, to control the amount of light that enters by
contracting or stretching as needed, to shrink or enlarge
the light-admitting hole (which is called the pupil,) the
black-appearing circle within the iris.
The light-sensitive receptors in the eye are
specialized neurons located in the retina that lines all but
the front part of the eyeball.
There are two kinds of light-sensitive neurons in the
retina, the rods and the cones.
The cones are sensitive to colors, and the rods only
to white light. The
rods do not function well unless plenty of vitamin A is
present in the retina.
five, page 3
The rods and cones are the real light receptors.
The other parts of the eye play a secondary role.
Impulses resulting from the stimulation of the rods
and cones by light travel into dendrites in the optic nerve,
and then to “seeing centers” in the cerebrum.
The organ of vision is the most important receiving
apparatus of the body.
When we heat any substance, such as the filament in an electric bulb, it will emit light. It is possible, however, to make a body emit light without being heated. Certain materials will emit light or “fluorescence” if exposed to ultra-violet waves. “Fluor” is from the Latin word for “flowing.” Fluorescent light is distinguished from phosphorescent in that it is emitted as light while the stimulus is active.
You have seen luminous materials that glow in the
materials are either phosphorescent or radioactive.
A phosphorescent material must first be exposed to
light before it will glow.
The electrons in a phosphorescent material capture
and store the light energy so that a material may continue
to glow in the dark after the stimulus is removed.
Some mineral substances have this property,
especially phosphorus – (from a Greek word meaning
Tiny amounts of radioactive materials are used on
luminous watch dials to create light.
Radioactive atoms explode and shoot out high-speed
atomic particles and rays.
Electrons in nearby atoms are hit by these atomic
emissions and are knocked into higher-energy orbits.
Then they jump back to create the light we see on the
luminous materials of the phosphorescent type, which require
exposure to light, the radioactive light sources are
Some kinds of molecules can combine directly with
oxygen molecules in the air, and emit light without getting
hot. A piece of
phosphorus glows in the dark as its atoms combine with the
oxygen in the air.
A firefly can emit quite a bright light by producing
on the surface of its abdomen two chemicals whose molecules
combine and emit cold light.
In fact, one of the coolest lights known is that
produced by a firefly. This
is 90% light and only 10% heat.
Man has not been able to equal the efficiency of this
ordinary light bulb gives off only 25% light and 75% heat.
If we fill a tube like the one used for fluorescent
light with a special chemical, mercury, we find that this
tube will emit both visible and ultra-violet light.
If the tube is surrounded by a special glass that
absorbs the visible light, only the ultraviolet light comes
through. This we
have called black light.
Ultraviolet rays and black light are also used to
sterilize milk and to keep meat stored in a refrigerator
from spoiling. Black
light can be used to detect fingerprints which are not
visible to the human eye in ordinary visible light.
If the prints are treated with a fluorescent powder
and exposed to black or fluorescent light they will show up
five, page 4
the sense of seeing is most
important of the senses, though we see nothing really.
all of life in pictures.
We know more of life through pictures than any other
thoughts form mental pictures.
Words form mental pictures; and once the picture is
formed, the judgment can be made.
never seen an object in the world.
You have only seen a reproduction in your mind.
Neither you nor anyone else knows how anything looks
in the world, they have never seen it.
All you have seen is electro-chemical interchange
reproductions in your mind.
only seeing is spiritually, and it isn’t done with the
you get this thinking of yours straightened out, then maybe
How do you bring it through?
Man is a broadcasting station.
If you receive that with your mechanism, then self
analyses it. Make
your mind a blank screen and receive what you are looking
Esoterically speaking, all matter radiates light; all
matter is luminiferous, and therefore has color vibration.
Matter continually emits rays, and throws off
vibrations which materially affect us.
Matter and light are fundamentally inseparable; solid
matter, reduced to its essence, is radiation identical with
This brings to mind the ancient teaching that the universe has evolved from the primal Cosmic Fire, or Great White Light, which is an emanation of the Divine Being at the Source of all Light.
1) Superior levator muscle of
2) Superior rectus muscle
3) Trochlea of superior
4) Superior oblique muscle
5) Tendinous insertion superior oblique
7) Upper eyelid
8) Meibomian gland
Iris 11) Pupil
Meibomian gland and duct
Inferior oblique muscle
Inferior rectus muscle
Internal bony wall of orbit
Optic nerve 19)
1) Superior levator muscle of eyelid
2) Superior rectus muscle
3) Trochlea of superior oblique
4) Superior oblique muscle
5) Sclerotic coat
6) Portion of eyelid
7) Internal rectus muscle
8) Lacrimal sac (nasolacrimal duct)
9) Carnucula lacrimalis
10) Medial palpebral ligament
13) Inferior oblique muscle
14) Inferior rectus muscle
15) Lateral rectus muscle
16) Lateral palpebral ligament
17) Lacrimal gland