On Dec 28, 10:00*am, Cecil Moore wrote:
Keith Dysart wrote:
You are out on your
Harley doing 60 miles/hour. How far do you travel in 0
seconds?

So your point was?

That was my point. You made it for me.

Ahhh. So the utility is the same utility one gets from
useful numbers like 60 miles/hour. OK.

I don't think the concept of instantaneous
power is mentioned at all in "Optics", by Hecht.
Ahhh. The difficulty is because you don't "think" that
the concept is mentioned in Hecht.

How did you manage to reply to a canceled posting?

I use http://groups.google.com to view usenet and
your post is still there.

Cancelling is a very iffy thing. Better to decide
before clicking send. Once it has entered the net
it is likely there forever. Readers and servers
may, or may not, honour future requests.

...Keith