Rowland circle
Rowland circle
A circle, which is virtually drawn tangent to the center point of a spherical concave grating with a diameter equal to the radius of curvature of the grating. (This circle is half the size of the circle produced by the concave grating.) When a slit is placed at an arbitrary point on the "Rowland circle" and is illuminated with light. The light whose source is at the slit causes diffraction with the concave grating and forms an aberration-free spectrum on a position of the Rowland circle.
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