This may be achieved by using a parabolic mirror.
Even on Earth you can light a cigarette with a parabolic mirror that's probably no wider than your hand.
Had the elevation of the parabolic mirror been a few yards higher, none could have lived to tell the tale.
A perfect parabolic mirror will bring parallel rays to a focus at a single point.
In industrial cases a parabolic mirror can concentrate sunlight on the tube.
On top of the receiver a small parabolic mirror can be attached for further focusing the light.
It featured a small 12-volt bulb reflected by a large parabolic mirror.
She uses a parabolic mirror to focus light rays from the sun.
A simple example of this is a good quality flash light that uses a parabolic mirror.
Słownik astronomiczny