ogugua belonwuThe sun emits a particle known as a photon, which carries visible light to earth. These photons contain energy, which they radiate in the form of heat.
Normally, the photons wont cause any probs in their normal state.
When you put a magnifying glass or a convex lens in the paths of these photons, the convex lens narrows and focuses the photons, making them converge on a narrower point than if the lens wasn't there.
This concentration of photons concentrates the heat that they emit, heating the polythene up until it ignites at a certain temperature. 0024 October 2010
earnest erihbrawhat if the polythene is replaced by an exposed skin...will it cause the same heating and melting effect 0025 October 2010
ogugua belonwuyeah it will cause the same heating effect, might lead to slight burns if exposed over a long period of time 0025 October 2010
martin oziokohydration takes effect before burnt. 0020 March 2011
ogugua belonwuhydration?? i think hydration is adding water, pls explain 0020 March 2011
nicholas bertrand anakwueWell, the converging lens, converges rays that hit it. So when placed at a position btw the principal focus and the pole of the lens, it magnifies the suns heat rays and concentrates it on the surface of the polythene. If u were with a diverging lens, the effect wont be the same, cuz the rays are diverted and not concentrated on the spot of the paper. 0016 May 2011