Which of the following is correct for light d | vedclass

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(D) For a point source of light, the light waves spread out in all directions, forming spherical wave fronts.As the distance $r$ from the source incre

Vedclass · Accepted Answer

Intensity decreases in proportion to the distance squared.

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(D) For a point source of light, the light waves spread out in all directions, forming spherical wave fronts.As the distance $r$ from the source increases, the surface area of the spherical wave front increases as $A = 4\pi r^2$.Since the total power $P$ emitted by the source is constant, the intensity $I$ is given by $I = P / A = P / (4\pi r^2)$.Therefore, the intensity $I$ is inversely proportional to the square of the distance $r$, i.e., $I \propto 1/r^2$.This means the intensity decreases as the distance from the source increases.

Which of the following is correct for light diverging from a point source?

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