By Diane Fisher Miller
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Extra info for Basics of Radio Astronomy for the Goldstone-Apple Valley Radio Telescope
Then, compared to the parallel waves that have passed farther from the object’s edge (for example “waves B, C, and D” in the illustration below), the waves that have bent around the edges of the object (“waves A and E” for example) will have travelled a shorter or longer distance from the object to any given point on the screen. Diffraction Pattern Curve shows distribution of brightness A Object edge • B • C • D • E Object edge • Screen-like surface Where waves interfere constructively, bright lines appear on surface.
Effects of Media 39 JPL D-13835 The effect is that the light waves are out of phase when they arrive at any given point on the surface. If they are 180° out of phase, they cancel each other out (destructive interference) and produce a dark line. If they are in phase, they add together (constructive interference) and produce a bright line. Diffraction is most noticeable when an electromagnetic wave passing around an obstacle or through an opening in an obstacle (such as the slit between your fingers) is all of the same frequency, or monochromatic.
_______________ _______________ occurs when two waves of the same frequency and traveling in the same direction meet in phase with each other. 5. The slight bending of electromagnetic waves around objects in their path is called __________________. 6. Scintillation is caused by electromagnetic waves being out of _________ after passing through a dynamic medium. 7. Faraday rotation occurs when an electromagnetic wave’s _______________ is changed as it passes through magnetic lines of force parallel to the wave and moving in the same direction.