Unlike a sound waves, light waves do not need a medium ... Light travels in a straight line. When drawing a light ray: Use a ruler and a sharp pencil to draw a straight line.

Refraction close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ray changes direction when refracted by a lens.

What's the deadliest part of a supernova explosion? To estimate this we have to look at what the actual destructive ...

During the time it takes for its wave to go through one cycle, a gamma-ray wave traveling at the speed of light will travel only the width of a proton, a tiny particle found within the nucleus of ...

"The gamma-ray burst traveled through intergalactic space at the speed of light for eleven billion years, during which time the Sun and the planets were born." — Timothy Ferris, in the film ...

Kyoto Prize winners came to San Diego for this year’s symposium. Kyoto Laureate John Pendry talked about the theory of ...

Many incompletely understood phenomena lurk in the borderlands between physical theories - between classical and quantum, between rays and waves ... the ideal plane waves described in textbooks. Real ...