The laptop screen, mobile screen you are looking at right now is luminous but the page of your book is a non-luminous object, which is why you need a light on to read it. Where \ is the Stefan’s constant and $L$ is the luminosity. The Dictionary is a valuable practical work, not remarkable for philological research, but for its happy and luminous definitions, the result of great. It is related to the surface area (A) and the effective temperature ($T$) ( the temperature of a black body having the same radius as the star and radiating the same amount of energy per unit area in one second ) by a form of Stefan’s law, here is given by The brightness of a star is defined as the total energy radiated in unit time. Luminosity – It is defined as the luminous intensity in a particular direction or we can say it is the apparent brightness of an image. Other examples of Non luminous bodies are pen, pencil, chair, wood etc. Moon is an example of a non-luminous object as we can see the moon because it reflects light from the sun. Objects like the moon that do not give out or emit light of their own are Non- luminous objects. Non-luminous objects:- the objects that can not emit light energy by themselves are known as Non- luminous objects. Other examples of luminous bodies are Electric bulb, torch etc. Objects like the sun that give out or emit light of their own are luminous objects. Luminous objects:- The objects that can emit light energy by themselves are known as luminous objects. Luminous intensity is the measure of the light-emitting ability of a light source, either generally or in a particular direction. Hint: Luminous intensity – The luminous intensity is represented by (\).
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