Reflectivity and Brightness
Name: Philip R.
I am a student in England and need your help, I am
currently running an investigation to see whether steel has comon
reflective properties as a mirror has, I know that the Energy given out
from a bulb is 1/r(squared) but i am not sure how to follow this equation
when it is reflected off a mirror into a L.D.R. Please can you help me?
If the mirror is planar, all you need to do is measure the distance the
light travels from the source to the detector including its reflection, and
that is your r. However, if the mirror is curved, the intensity of the light
reaching the detector depends on how much the mirror focuses or defocuses it.
For that, you need to figure out from your r^(-2) formula how much light
reaches the mirror, and then you need to determine how much of that light
reaches the detector.
Richard E. Barrans Jr., Ph.D.
PG Research Foundation, Darien, Illinois
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Update: June 2012