Then with two filters were put together and aligned so that light passed through them, looking through them at a bright light in this case a flash light was used. Then slowly one of the filters was rotated through 3600 while keeping the other one still. Observations were then recorded. OBSERVATIONS: From my observation in part one by placing the two filters together one in front of the other and slowly rotating one of the filters notice that light between them became brighter as one filter was being rotated then the light became a dark blue shade.
PART II – In part two of the experiment one popularizing filter was placed on top of the other o that light was transmitted. Next cloth pins were attached to each side of the bottom edge of the combined filters. The clothes pins supported and allowed the filters to rest perpendicular to a table where they were placed. A CDC cell was then placed behind the filter assembly so that the photocell’s light sensitive surface was unobstructed and faced to the Polaroid filter assembly about 5 to 10 CM away from the center of the filters. To support the photocell it was taped to a drinking glass.
The illustration below shows the basic configuration you need to achieve. Next the two wires of the photocell were attached to the DIM IA two jumper cables. The DIM was set as an ohmmeter. The resistance had to be inversely proportional to the incident light intensity. Then using a flash light that and paper cone to focus the light, shine light through the popularizing filter assembly at the photocell. Because the filters were aligned to allow light through, the angle between them was zero. The angle and the corresponding resistance was then recorded.
The last step in this experiment was to rotate one of the filters 150 and take another angle and resistance reading; while doing this the positions of the light SOUrce and photocell couldn’t change thorough out the experiment. Additional readings were taken every 1 50 though a complete 3600 of the rotating filter. Finally the outcomes of each light intensity reading was graphed using I/R vs… Angle between popularization axes. OBSERVATIONS: As I tried to shine the light through the filters as one was being adjusted to the angle given, I noticed that as the angle increased it was more difficult for the light to shine through.
My observation when measuring the resistance are recorded above. The digital multi meter was set on 200 ohms. PART Ill- In part three “Popularization by Reflection” looking out the window at a car indelible that is reflecting sun light. Then holding each of the two linear popularizing filters in front of the eyes in a way that best reduces the glare from the window. Then a vertical mark was made on top of the filter while it is in this position. The lines made marked the transmission axis of the filters.
Next noticing how the best glare reduction is achieved from a filter with its transmission axis in a vertical position the light reflected from a horizontal surface is horizontally polarize. This experiment illustrated the way polarize sunglasses reduce glare from snow, ice, water and the front of your car. OBSERVATIONS: When working with this part of the experiment I noticed that I was indeed less bothered from the glare when I held one of the filter that had its axis in a vertical position.
PART In part five of this experiment popularizing filters were used to look at the sky at 90 degrees to the direction of the sun. Looking at different regions of the sky and noticing if the intensity of the light changed as you rotate the polarize. OBSERVATIONS: When holding the popularizing filters in a bright region of the sky, I noticed that the region I was looking at became dark as I was rotating one of the popularizing filters. Discussion 1 . If you buy sunglasses how can you be sure they are truly polarize?
When buying polarize sunglasses you can make sure they are truly polarize by holding two pairs of identical sun glasses together one in front of the other in such a way that you are able to see through them; then slowly rotate one of the glasses to about a 900 angle, and if your vision through the second lenses gets visibly darker that means they are indeed polarize sunglasses. CONCLUSION: In conclusion polarize lenses helps to reduce unwanted reflected glare off surfaces such as those from the water, road, and even snow covered areas.
Throughout the experiment using the polarize filters it was clear that when rotating one the filters the image or region being looked at increased in brightness and then it became dark making it difficult to see through the filters. This was proven multiple times when looking at bright regions of the sky, and looking out the window of a car windshield that was reflecting sunlight. Problems were encountered when conducting part two of the experiment, it was difficult to position the popularizing filter at the precise angles. As the angle increased the light beam did not shine through as much as it did in the angles less the 90 degrees.