Light FAQs:

Q: Is light electromagnetic radiation within a certain portion of the electromagnetic spectrum?

A: Yes.

Q: Was light that waves were known to bend around obstacles?

A: Yes, while light travelled only in straight lines.

Q: Was light composed of corpuscles which were emitted in all directions from a source?

A: Yes.

Q: Was light related to electromagnetism?

A: Yes.

Q: Is light rotated when the light rays travel along the magnetic field direction in the presence of a transparent dielectric?

A: Yes, and an effect now known as Faraday rotation.

Q: Is light emitted and absorbed in tiny "packets" called photons and exhibits properties of both waves and particles?

A: Yes.

Q: Was light a high-frequency electromagnetic vibration?

A: Yes, and which could propagate even in the absence of a medium such as the ether.

Q: Is light measured with two main alternative sets of units: radiometry consists of measurements of light power at all wavelengths?

A: Yes, while photometry measures light with wavelength weighted with respect to a standardised model of human brightness perception.

Q: Was light a wave?

A: Yes, and these waves could gain or lose energy only in finite amounts related to their frequency.

Q: Was light entirely transverse?

A: Yes, and with no longitudinal vibration whatsoever.

Q: Is light intensity?

A: Yes, and propagation direction, frequency or wavelength spectrum, and polarization, while its speed in a vacuum, 299,792,458 metres per second, is one of the fundamental constants of nature.

Q: Is light one of the five fundamental "subtle" elements out of which emerge the gross elements?

A: Yes.

Q: Was light performed in Europe by Hippolyte Fizeau in 1849?

A: Yes.

Q: Is light only a mechanical property of the luminous body and the transmitting medium?

A: Yes, and Descartes' theory of light is regarded as the start of modern physical optics.

Q: Was light a mechanical property of the luminous body?

A: Yes, and rejecting the "forms" of Ibn al-Haytham and Witelo as well as the "species" of Bacon, Grosseteste, and Kepler.

Q: Is light not orthogonal to the boundary?

A: Yes, and the change in wavelength results in a change in the direction of the beam.

Q: Was light conducted by Ole Rømer?

A: Yes, and a Danish physicist, in 1676.

Q: Was light emitted in all directions as a series of waves in a medium called the Luminiferous ether?

A: Yes.

Q: Was light a form of electromagnetic radiation: he first stated this result in 1862 in On Physical Lines of Force?

A: Yes.

Q: Is light a transverse wave?

A: Yes.