Sentence Examples with the word db

If the ray suffers one internal reflection at D, then it is readily seen that, if DB be the path of the reflected ray, the angle ADB equals 2r, i.e.

The rods BC and DB carry two small rods EF, GF jointed at F; at this joint there is a pin which slides in a slot on the rod BH, which is normal to the mirror X.

Draw any straight line at right angles to CA and DB (produced if necessary), meeting them in M and N.