# Essay about Light Intensity of Incoherent Lights

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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 to investigate whether light intensity of incoherent light varies inversely with the square of the distance in real-life situations and under laboratory conditions. The light of an incoherent light source will spread out uniformly in all directions. In other words, any point source which spreads its influence equally in all directions without limit to its range will obey the inverse square law. Luminous intensity is proportional to the inverse square of distance, I ∝1/r2. The calculations below show how this formula was derived:

Light intensity = power / area.

Surface area of a sphere = (4πr2) / 3

So, the luminous intensity on a spherical surface a distance r from a source radiating a total power P is:

I = 3P / 4πr2

As P and π remain constant, the luminous intensity is proportional to the inverse square of distance:

I ∝1/r2

The light intensity is the power of the lighting energy and its unit is candle (cd). The unit for lighting reflux is lumen (lm).

It is hypothesised...

... middle of paper ...

...ce will obey the inverse square law given that the light source is non-coherent.

This experiment has the potential to test whether the light intensity of a coherent light varies inversely with the square of the distance under laboratory conditions and in real-life situations. This was because this experiment only tested the light intensity of an incoherent light varies inversely with the square of the distance in real-life situations and under laboratory conditions. If this experiment were to carried on and the results showed that the coherent lights such as laser did not obey the inverse square law, then this will support the theory that only incoherent lights obeys the inverse square law.

Conclusion:

Light intensity of incoherent lights varies inversely with the square of the distance holds truth in real-life situations and under laboratory conditions.

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