Light have 7 spectrum. Is it because each one has different mass. If so can a person increase speed of light

Question

by making these light to go through friction in a vacume.

Answer 1

Light has 7 spectra because some person semi-arbitrarily decided that six wavelengths (or frequencies) of light were "special", and that the spectra they delineated had some unique properties.  In reality, there are far more than 7 spectra, probably about 100 total.  Just to give you some examples starting at the high end:

Cosmic Rays - Photons with wavelengths that are too short for nuclear reactions.  They usually interact with fundamental particles.

Gamma Rays - Photons with wavelengths that are involved in nuclear interactions

Hard X-Rays - Photons with wavelengths too short for atomic interaction, but too long for nuclear interaction

Soft X-Rays - Photons with wavelengths that can ionize core electrons in atoms

Vacuum UV - Photons with wavelengths too short to be seen by the human eye, and are absorbed by the atmosphere (they only travel in vacuum).  This is sub-divided into Far UV and Extreme UV.

UV-C - Photons with wavelengths too short to be seen by the human eye, and can cause damage to living organisms. This spectrum overlaps some with Vacuum UV.  UVC is strongly filtered by O-zone.

UV-B - Photons with wavelengths too short to be seen by the human eye, and are filtered by soda-lime glass.

UV-A - Photons with wavelengths too short to be seen by the human eye, but have no special characteristics.

Visible - Photons that can be seen by the human eye.

Infra Red - Photons with wavelengths too long to be seen by the

human eye.  Subdivided into Short, Medium, Long, and Very Long Wave Infra Red - These four spectra are determined by the four transmission windows in the atmosphere that allow IR to pass.

Wow!  10 Spectra, and I haven't even hit microwave spectra yet.

Friction?  Light doesn't experience friction.  It travels at a fixed speed which is dictated by the medium, no faster or slower.

Answer 2

no, light have 7 spectrum not because of different mass but because of different wavelength and frequency and since light is a electro magnetic wave so,its speed in vaccum is fixed i.e.3x10to the power 8 ,friction can not increase speed of light