When we heat up a solid body above a certain temperature, it radiates light energy. Actually, when we gradually heat up a body, above room temperature, it radiates energy in form of electromagnetic wave. The …
Read moreRadiation of Light from a Hot Body and Radiant Efficiency
Light Energy Light is nothing but the electromagnetic waves of wavelengths within a specific range which can create vision sensation to the human eyes. Maybe there are some electromagnetic waves of different wavelengths which can …
Before discussing the laws of illumination, we would recall the term illumination. Illumination is defined as the incident luminous flux per unit area on a surface. Luminous flux is the radiation of light energy per …
An incandescent lamp works in a very simple principle. When a current flows through a resistance, the ohmic loss occurs. This ohmic loss contributes heat to the resistance. Actually the heat is nothing but the …