Huygens stated that an expanding sphere of light behaves as if each point on the wave front were a new source of radiation of the same frequency and phase. Falcon can see a 10 cm. object from a distance of 1.5 km. Speed it up and you see a constantly moving image. Penguin Has a flat cornea that allows for clear vision underwater.
Penguins can also see into the ultraviolet range of the electromagnetic spectrum.
Sparrow Retina has 400,000 photoreceptors per square. Brightness is a perceptual response to the physical property of intensity. Else answer it Summary Light is a transverse, electromagnetic wave that can be seen by humans. Like all electromagnetic waves, light can travel through a vacuum. Light is produced by one of two methods.