We are currently undertaking an investigation into chlorinated pool water and how various factors can affect the quality of it. We are attempting to determine the amount of "free chlorine" (HOCl/OCl-) in a given sample of pool water.
This pool water is labelled as 200 ppm, and is "stabilized"...
Sorry for the late reply.
So, to re-iterate and summarize (correct me if I'm wrong)
When focusing the light onto the paper, an image of the sun is formed. This image changes in size as the focal length does, with a longer focal length producing a larger image, in accordance with the laws of...
Unfortunately I haven't been able to look through the lens and focus a very good image (bottles aren't very good), though I can tell it magnifies to an extent. I've been able to focus an image of the outside (window) however, and the image is inverted on both axes.
Still, I don't understand...
So I've been doing some experiments, using bottles filled with various liquids and timing how long they take to burn paper which is placed at the focal point (where the light was focused). I've noticed that using denser liquids with high refractive indexes lower the focal length, and thus...