Optical isolator. consider a system consisting of a perfect horizontal transmission polarizer, followed by a quarter wave plate with its fast axis oriented at +45 degrees, followed by a retroreflecting mirror. 4. a. assuming that the waveplate is exactly quarter wave at the operating wavelength, what is the reflection backwards through the polarizer? why?

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

you can cut your hand off if your not