parallel rays
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par·al·lel rays
rays parallel to the axis of an optic system.
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Continuing west from A are two nearly parallel rays, and extending perpendicular to Messier are radiating swaths of faint rays.
One mirror collects light rays from the lamp and reorients them into a beam of parallel rays aimed at the disturbance.
What is the equivalent of using the parallel rays from the moon as a useful compass?
He said: "Laser beams are parallel rays of light - they'll go very far at the same intensity.
If a dichroic mirror is used, for example, there are fewer deviations resulting from differences in the angles of rays passing through the center or off-center, since the dichroic mirror design is based on the principle of parallel rays.
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