As a practical example, an astigmation corrected scanning flat holographio concave grating (SFHCG) is designed and some results of the numerical and optical experiments are given.
While Galileo used a concave lens for his eyepiece, the standard refracting telescope uses a convex, converging lens for both the objective lens and the eyepiece.
They plunged into the concave field on the other side of which rose the village-the field wherein Jude had received a thrashing from the farmer many years earlier.
CEMOS AUTOMATIC oversees the configurations of numerous components, such as concave clearance, drum speed, concave bar, concave flap, fan speed, upper and lower sieve openings, rotor speed, and rotor flap.