Re: E = 1/2mv^2


tomgee wrote:
PD wrote:
tomgee wrote:
PD wrote:
tomgee spluttered:
PD wrote:
tomgee foamed:
PD wrote:

[pointless dodging snipped]

SNIP

Um, no. You can only see whatever light illuminates. You can see the
source and the objects illuminated by the light, like a welder sees the
flame illuminated by the light, but you cannot see light itself. You
cannot see the em waves and the photons, you can only see through light
and not through the dark.

Ah, I see. So our retinas are tuned to respond to flashlights, not to
the light from flashlights. Right.

No, you don't see. You still don't get it. Our retinas do not respond
to light.
Our eyes respond to the intensity of light. Our retinas receive the em
waves
and the photon particles that is touching them at any given moment.
Our
optic nerves carry the data imprinted on the retinas by the light to
our brains
which then interpret the data.

More babble, Tom. You say our retinas "receive the em waves and the
photon particles that is touching them". EM waves and photon particles
are light. Substitute the synonym, and reread: "receive the light that
is touching them". And then you say "Our retinas do not respond to
light."

Yes. Your opinion is that our retinas have the capacity to respond to
light shone unto them,

That's correct.

yet everyone but you knows our retinas do not
respond to light,

No, nobody with a rudimentary knowledge of the retina
would say such a thing. The retina consists of sensing
cells which absorb photons, and put out signals
in response to those photons.

they simply act as screens onto which the data in a
light wave is impressed.

No they don't. The response of a retina cell
is proportional to (log of) light intensity. The
output is that encoded strength signal. But the
retina cells are the actual sensor. Beyond the first
layer of retina cells, it isn't light any more. It's
an encoded response to light. The responding
happened in the retina.

What, do you think the optic nerve is just a bunch
of optical fibers whose ends are the retina, and
the light goes unaltered down to the brain?

- Randy

.

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