21. The Klein Gordon equation for a free particle has a simple plane wave solution. 22. Plane wave technique is thus promising as it can generate very high frame rate.23. Observe that the first term equals the real form of the plane wave just discussed. 24. The diffracted plane wave has a wave vector "' 25. For a sinusoidal plane wave propagating along z axis the orbital angular momentum density vanishes. 26. The phase factor is represented by a plane wave . 27. A linear filter transmits one component of a plane wave and absorbs the perpendicular component. 28. This is true : a plane wave is really a spherical wave of infinite radius. 29. With good optics and a very small pinhole, one could even approximate a plane wave . 30. The simplest form of a wavefront is the plane wave , where the rays are AU ).
