IR Focusing

An infrared (IR) focusing demonstration involves using a round flask filled with a solution of iodine in carbon disulfide as an IR lens to focus the radiation from an arc lamp. This setup demonstrates how infrared radiation, which is invisible to the naked eye, can be manipulated similarly to visible light using appropriate lenses and filters. By focusing the IR radiation on a match, it ignites, illustrating the concept of energy transfer through radiation. The iodine solution acts as a filter that absorbs visible light but transmits IR radiation, emphasizing the different behaviors of various wavelengths of light. This experiment helps visualize the power of infrared radiation and its applications in heating and thermal imaging.