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The intensity of light at a distance 'r'...

The intensity of light at a distance 'r' from the axis of a long cylindrical source is inversely proportional to 'r'

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To solve the problem, we need to analyze the relationship between the intensity of light and the distance from the axis of a long cylindrical source. Here’s a step-by-step breakdown: ### Step 1: Understand the Concept of Intensity Intensity (I) of light is defined as the power (P) per unit area (A) over which the power is distributed. Mathematically, it can be expressed as: \[ I = \frac{P}{A} \] ### Step 2: Identify the Geometry of the Cylindrical Source For a long cylindrical source, the light spreads out in a cylindrical wavefront. The area over which the power is distributed at a distance \( r \) from the axis of the cylinder can be calculated. ...
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