How islight intensitymeasured

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A light bulb produces 100 J of energy every 5 seconds. What is the intensity of light measured at 6 m from the light bulb?

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The intensity of a radio signal is 0.120 W m–2 at 16 m from a small transmitter. What is the intensity of the signal 4.0 m from the transmitter?

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The following diagram will help you visualise the equation above. As the distance from the source of light increases, the light energy is spread over an increasing area, resulting in a decreasing intensity. Inverse square law for intensity not only applies to light but other electromagnetic waves such as radio waves.

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If the power of the light source remains constant, that is if the rate of energy transfer remains unchanged, the following expression is true:

Light intensity

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The inverse square law is a principle that states that the intensity of light radiating from a point source diminishes with the square of the distance from the source. This means, if you double the distance from the light source, the intensity becomes a quarter of its initial value.

For a light source that radiates outward, the area it covers can be modelled as a sphere. Therefore, the equation can be modified by using the surface area of a sphere (`A = 4 \pi r^2`):

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The working distance is the distance from the front of the lens to the focal plane. The objectives are designed that this is also where zero OPD occurs. Because ...

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Light carries energy. When it falls upon a surface, this energy is transferred to that surface. The greater the intensity of light hitting the surface, the more energy is transferred to that surface in a given time.

In basic terms, the intensity of light at a point refers to the power of the light (in watts) arriving per unit area (typically in square meters) at that point. It quantifies how much energy from the light source strikes the surface each second.