Collimator
= Collimator
{wiki}
A collimator turns light from a source near its focus into a nearly parallel beam. A slit of width $x$ produces an angular width approximately $x/f$, where $f$ is the <focal length>.
= Collimator
{wiki}
A collimator turns light from a source near its focus into a nearly parallel beam. A slit of width $x$ produces an angular width approximately $x/f$, where $f$ is the <focal length>.