Accessing Your Lab Grade
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When you access your lab grade online, it will
look somewhat like this.
Physics 101 Lab Grades as of 9-28-08


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Lab 1
Lab 2
Lab 3
Lab 4
Lab 5
Lab 6
Lab 7
Lab 8
Lab 9
Lab 10
Lab 11
Lab 12
94
u
100
75
60
e
96
85
94
100
u
99
A “u” means an unexcused absence.
An “e” means excused absence.
Go to this site. For more instructions, check
your email from Dr. Downing.
The Ray Box: Part One
Law of Reflection
The law of reflection for light states that when
light is incident on a specular reflecting surface
the angle of incidence is equal to the angle of
reflection.
A specular reflector is a mirror-like reflector.
Normal
Incident Beam
qi
qr
Mirror
Reflected Beam
qi  qr
No matter what the shape of the mirror is,
if it is a specular reflector, the incident
beam angle and the reflected beam angle
will be equal to each other.
Specular reflection occurs all around us
from the mirrors for shaving or make-up
applications, to road reflectors, to
reflections from smooth surfaces such as
water and glass.
Obviously there are many, many more.
Different Shaped Reflectors
This shape mirror converges light rays
(Obeys the law of reflection)
Concave make-up mirrors and satellite dishes are similarly
shaped, and they
converge EM waves.
This shape mirror diverges light rays
(Obeys the law of reflection)
Shoplifting mirrors and rear view car mirrors, passenger side,
are similarly shaped.
Flat mirrors neither converge nor
diverge. They just redirect.
(Obeys the law of reflection)
Video (URL) on How to Find Normals