Noor Afsha

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what is light?

i have been taught that light is made up of small bundles or packets of energy. what i am not able to understand is that is it light whole sole one entity? or it is an entity madeup of the bundles like a body is made up of cells.

secondly, the speed of light is the maximum...or due to light we observe time, due to light we see objects or everything.

how can one comprehend light completely?

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    Mar 19 2012: Light is just abstraction for electromagnetic wave that can be sensed (seen) by human eye. So it is energy in form of a wave traveling in particular direction, it cannot stop or speed up it propagates at constant speed (assuming emty space). Light is abstracted as being made of photons, which are just energy in intervals of the wave making up the light.
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      Mar 19 2012: we can not see light but the reflection of it that makes the images and we see them. we actually dont see light.

      but, from the point of light, can any movement is observable or any object?
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        Mar 19 2012: Reflection of light is also a light. Human eye sees light, otherwise all we see would be only absolute darkness.
        When it comes to light being observant, light is to space as sound is to the air.
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          Mar 20 2012: You mean light can fill a space?

          would we able to see light while in space?
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        Mar 21 2012: A single beem of light can't fill space, it would be a line through space. But omnidirectional source of light can fill space around it with light.
        We see the light when it enters our eye and when receptors in the eye detect it. In other words! we can see what we a looking for.
        Update: using 'line' for beam of light was an abstraction. Beam of light is combination of electric and magnetic forcefield, rotating around a line, forming concentrations in form of a helix.
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    Mar 20 2012: Wave and/or particle light is thought to have a constant speed in a vacuum. Using the square of that speed a given mass will convert into a given energy, and vice-versa. Relativity does apply.
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    Mar 19 2012: Light is the electro-chemical energy form which enables the sense of vision in living beings. The eye is one of the brain's sensors used to gather information about ambient conditions. Albert Einstein theorized that light energy actually consists in the form of traveling particles, called photons. Prior to Einstein light was thought to propagate in waves of varying frequency. Neither theory has been exclusively adopted by modern science.
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      Mar 19 2012: so we dont know the exact definition of light.... with unanimity?
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        Mar 19 2012: Ahhh. You seek that elusive condition called unanimity? The American Heritage Dictionary of Science defines light as: "A form of radiant energy consisting of electromagnetic waves that travel freely through space. . . etc." As far as waves or particles, or both, the jury is still out.
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          Mar 20 2012: thanks edward.

          would you please tell me that if we consider any nature of light, the theory of relativity is applicable?