A little video we made for our Physics TFU Project. It's all about trying to burn an object using Reflection and Refraction. Group Members: Isaac Tay, Low Qi Xun, Abdul Aziz, Li Ming Ren. Script: How to burn an object using the concept of refraction or by reflection light rays from the sun. Based on the myth of the Archimedes death ray. These are the apparatus we are using. An empty can of soda. Metal polish Now Start polishing the bottom of the can to make it mirror-like. Now we head outdoors at midday, around 12noon to 2 pm, when the sun is bright and strong. Find the focal point by moving the leaf up and down slowly. Smoke Watch caaaarefully. How does it work? The bottom of the can serves as a parabolic concave mirror which reflects and converges the suns rays onto the focal point. This concentrates the heat of the sun. This can be seen in the diagram, where we have traced the suns rays as they travel and are reflected by the concave mirror which is the soda can, to converge onto a point. Refraction These are the apparatus we are using. Find the focal point. Now, wait as the point of concentrated suns rays burn the leaf. Check it out in Fast forward. How it works. The convex lens of the magnifying glass will focus the suns rays on to a point. This concentration produces a point source of heat, similar to the experiment using the soda can. This heat can burn a hole in the leaf. The magnifying glass can converge the suns rays because of the convex lens and the refraction ...
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