Topic Content:
- How Light Travels
Light energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More travels in straight lines in what is called Rectilinear propagation of light until it encounters an obstacle. The path along which light travels is called a Ray of Light.
The pinhole camera is a device that operates on the principle that light travels in a straight line by producing an object placed in front of it.
The device which can be used to show that light is a form of energy is called a photoelectric cell.
Some objects give out light, these objects are said to be Luminous which could be natural self-luminous objects e.g. sun, stars, glowworms, and fireflies, or artificial self-luminous e.g. electric lamps, and candles.
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