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Causing the beam which builds the image of our carbon-points to pass through the spar, the single image is instantly divided into two. The two beams into which the spar divides the single incident-beam have been subjected to the closest examination. They do not behave alike.
Meanwhile the beam passes unseen through the air above the water, for the air is not competent to scatter the light. A puff of smoke into this space at once reveals the track of the incident-beam. If the incidence be vertical, the beam is unrefracted. When the beam is incident along B E, which is perpendicular to A C, there is no refraction.
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