parabolic reflector

But a parabolic telescope must be steerable and able to point at astronomical objects and track them as Earth rotates, because parabolic reflectors distort waves from off-axis targets.

Louis XIV was fascinated by parabolic reflectors, concave mirrors that reflect and intensify the sun.

According to a University of North Carolina website, since 1950, the light has used a device where two 1,000 watt bulbs protected by aluminum drums burn in front of parabolic reflectors.

According to a University of North Carolina website, since 1950, the light has used a device in which two bright bulbs protected by aluminum drums burn in front of parabolic reflectors.

At any distance the beam from the parabolic reflector will be more intense than that from the spherical one, since the rays will be closer together.