Light Intensity of Incoherent Lights

2432 WordsJun 16, 201810 Pages
Abstract: To investigate whether light intensity of incoherent lights varies inversely with the square of the distance holds true in real-life situations and under laboratory conditions. Techniques utilised in the experiment included measuring the distance from the light source to the light sensor, recording the light intensity of a light source and recording observations with accuracy. The light from the light source that passes through the cardboard cylinder tube changes as the distance from the light sensor increases. The results show that light intensity of incoherent lights varies inversely with the square of the distance in real-life situations and under laboratory conditions. Introduction: The purpose of this experiment was…show more content…
The incoherent lights that were used are microscopic, fluorescent and LED light. Visible light consists of several different colours. The different colours represent different wavelengths of the radiation spectrum. One lumen is equivalent to 1/680 Watt of light with a wavelength of 555 nm. The relationship between illumination and visual response renders the lumen the preferred photometric unit of luminous flux for practical applications. For example, the electric light bulb emits light which consist of many different wavelengths. The visible light waves consists of a continuous range of wavelengths or frequencies. There are numerous of situations that could happen when a light wave with a single frequency strikes an object. An object could absorb the light wave. In this case, the energy will be converted to heat. However, the object could reflect the light wave depending on the material of the object. Furthermore, the object could transmit the light waves. Therefore, the manner in which visible light interacts with an object is dependent upon the frequency of the light and the nature of the atoms of the object. Therefore, visible light affects the luminous intensity, thus it might not obey the inverse square law. Materials: 1. Cardboard cylinder tube (80cm) 2. Light sensor 3. A ruler 4. Microscopic Light 5. LED light 6. Fluorescent light 7. Lab quest 8. Laptop 9. USB cable

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