Idil+B14

==DETERMINING **WHICH TYPE ** **OF LENSES ARE THE MOST PROTECTANT AGAINST BOTH UV AND FLASHLIGHT LIGHT** ==

Idil B.

2013-2014


 * Abstract **

The purpose of the first experiment was to test which type of lenses were the most UV light protective. The hypothesis was that the brown tinged lenses would be the most UV light protective. That is because the lenses are darker than most of the other lenses, and because those were one of the thickest lenses. The method that was used to perform this experiment went as such. First UV beads were placed behind each set of lenses. Then the UV light was shined on the lenses for 30 seconds. Next, the amount of UV light was measured using mW/cm2. Lastly, the results were recorded and the experiment was repeated. The lenses that blocked the most UV light were the tinted and the brown tinged lenses. They let through 0 mW/cm2. The least protective lenses were the blue tinged lenses. They let through 3 mW/cm2. The clear lenses ended up letting through 2 mW/cm2. The purpose of the second experiment was to test which type of lenses blocked the most light from a flashlight. The tinted lenses blocked the most light. They only let through 84 lux of light. The least protective lenses were the blue tinged lenses. They let through 289 lux of light. The brown tinged lenses let through 246 lux of light. Lastly, the clear lenses let through 238 lux of light.

**Experimental Improvements and Future Experiments **
This experiment could be improved by using the sunlight instead of a UV light. It could also be improved by testing both the UV light and the flashlight light in darker rooms. Some future experiments that could be performed are testing if UV light from pointers is any different from UV light that comes directly from the sun; and if flashlights are shined on sunglasses/lenses for a long period of time, will the lenses become less UV protectant. In addition, the UV and flashlight light protectancy when different liquids are poured on to the lenses, could also be tested.

If you want to read the whole experiment, here is the PDF: 