Richard Clark wrote:

On Thu, 30 Jun 2005 12:14:36 -0500, Cecil Moore
wrote:

More of the same personal stuff. How about some
technical content for a change?


http://www.qsl.net/w5dxp/weblaser.GIF
(which I am sure you will soon hustle off in embarrassment)

For an angle of incidence of 30°

The angle of incidence is always 90 degrees. It is drawn that
way because it cannot be drawn in one dimension. This is typical
of physics textbook drawings. An angle of incidence of 30 degrees
is irrelevant to this particular example.

How much power is reflected from Surface A (first incidence)?

The reflectance is 0.01, so 1%. First incidence 0.01 watts

How much power is reflected from Surface B (first incidence)?

The reflectance is 0.01, so 1%. First incidence is 0.0099 watts
Steady-state after re-reflection is 0.01010101 watts

How much power is transmitted through all interfaces?

One watt net to the "load".
The steady-state forward power in the thin film is 1.010101
watts of which 0.010101 is a steady-state internal reflection
from surface B.
--
73, Cecil, http://www.qsl.net/w5dxp

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