From this date onwards it is in full strength until October 20th, and is then for seven days gradually losing power on account of becoming overlapped by the incoming sign Scorpio. This sign of Libra is represented in symbolism as The Balance. The Sun, the ruler of our inner nature, falls in Libra, the exaltation of Saturn. Their love of justice, combined with the need to be fair and even-handed contributes to that characteristic difficulty such people find in making decisions quickly.
How it Works. The lasing medium will normally emit photons in specific spectral lines when excited by an energy source. The wavelength is determined by the different quantum levels, or energy states, of the material. Normally, most atoms in a medium are in the ground state.
Why does it happen? The simple answer is that light is a wave and reflecting, bouncing off certain other materials while retaining the same wavelengthâ¦sometimes, is just what waves do. A more detailed explanation is that the energy in light, photons, activates the electrons in some materials, causing them to move and emit photons likewise.