The intensity of light from a source is inversely proportional to its square of the distance from the source. If a pocketbook is 2.4 m from the lamp, the illumination on the page of the book is 500 lm/m2 (lumens per square meter). How far must the lamp be moved so that the intensity of light will be doubled?

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.