An optical illusion whereby, when a person fixes the gaze on a particular point, an unchanging stimulus away from the fixation point appears to fade away and disappear.

plural of Haas effect

plural of adverse effect

A phenomenon encountered in interferometry that is elicited by rotation. The Sagnac effect manifests itself in a setup called a ring interferometer. A beam of light is split and the two beams are made to follow the same path but in opposite directions. To act as a ring the trajectory must enclose an area. On return to the point of entry the two light beams are allowed to exit the ring and undergo interference. The relative phases of the two exiting beams, and thus the position of the interference fringes, are shifted according to the angular velocity of the apparatus.

greenhouse effect

plural of cis effect

plural of trans effect

(chemistry) The labilization (making unstable) of ligands which are trans to certain other ligands.

(chemistry) The labilization (making unstable) of ligands which are cis to certain other ligands.

The effect whereby the voting preference of a neighbourhood tends to be formed by consensus based on personal connections between residents.