Accessing Your Lab GradeAccessing Your Lab Grade When you access your lab grade online, it When you access your lab grade online, it

will look somewhat like this.will look somewhat like this.Physics 101 Lab Grades as of 9-28-08

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.A “u” means an unexcused absence. An “e” means excused absence.An “e” means excused absence. Go to this Go to this site. For more instructions, . For more instructions,

check your email from Dr. Downing.check your email from Dr. Downing.

The Ray Box: Part OneThe Ray Box: Part One

Law of ReflectionLaw of ReflectionThe law of reflection for light states that when The law of reflection for light states that when light is incident on a specular reflecting light is incident on a specular reflecting surface the angle of incidence is equal to the surface the angle of incidence is equal to the angle of reflection.angle of reflection.A specular reflector is a mirror-like A specular reflector is a mirror-like reflector.reflector.

Mirror

Normal

Incident Beam Reflected Beami r

ri

No matter what the shape of the mirror No matter what the shape of the mirror is, if it is a specular reflector, the is, if it is a specular reflector, the incident beam angle and the reflected incident beam angle and the reflected beam angle will be equal to each other.beam angle will be equal to each other.Specular reflection occurs all around us Specular reflection occurs all around us from the mirrors for shaving or make-up from the mirrors for shaving or make-up applications, to road reflectors, to applications, to road reflectors, to reflections from smooth surfaces such reflections from smooth surfaces such as water and glass.as water and glass.Obviously there are many, many more.Obviously there are many, many more.

Different Shaped ReflectorsDifferent Shaped Reflectors

This shape mirror converges light This shape mirror converges light raysrays

(Obeys the law of reflection)(Obeys the law of reflection)

Concave make-up mirrors and satellite dishes are Concave make-up mirrors and satellite dishes are similarly shaped, and they similarly shaped, and they convergeconverge EM waves. EM waves.

This shape mirror diverges light This shape mirror diverges light raysrays

(Obeys the law of reflection)(Obeys the law of reflection)

Shoplifting mirrors and rear view car mirrors, passenger Shoplifting mirrors and rear view car mirrors, passenger side, are similarly shaped.side, are similarly shaped.

Flat mirrors neither converge nor Flat mirrors neither converge nor diverge. They just redirect.diverge. They just redirect.

(Obeys the law of reflection)

Video ( (URL) on How to Find ) on How to Find NormalsNormals