Facts about Light
- The speed of light in vacuum is 186,000 miles per second or 300,000,000 m/s
- The speed of light is slower in transparent mediums like water, glass and air and depends upon the refractive index of the medium.
- Light is the visible part of the electromagnetic spectrum and the frequency of light lies between 4 x 1014 Hz to 8 x 1014 Hz
- Colour of light with the smallest wavelength is Violet with a wavelength of about 400 nanometers
- Colour of light with the longest wavelength is Red with a wavelength of about 650 nanometers
- The study of properties and the behavior of light is known as Optics
- Sunlight takes 8 minutes and 20 seconds to reach the Earth.
- Light takes about 1.3 seconds to travel from the Earth to the Moon.
- Three-dimensional imaging using interference of light is known as Holography
- System of light excitation used in surgeries, printers etc. is LASER
- The color of light which is most conducive to photosynthesis is Blue
Phenomenon
