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Light is not just a beam but a wave with an electric field that changes at a speed unimaginable to ordinary clocks. Until now, this field could only be measured at a single point, like taking temperature with a single thermometer. Now researchers have created a method that shows the entire field at once, like a thermal imager showing a heat map. They direct a light pulse onto a thin crystal and capture how the field changes around and inside it.

With this technique, scientists saw that light passing through a crystal does not scatter instantly but with a delay, and the pulse stretches in the process. Such details are not visible in ordinary simulations. They also traced the electric field lines as the pulse bends around the crystal's edges. It's like watching water flow around a rock, but instead of water, it's the invisible field of light.

This method paves the way for creating more precise optical devices and microscopes, where it's important to know how light behaves inside a material. Now engineers can see what they previously only calculated.