Optics is a branch of physics that deals with the phenomena associated with the propagation of electromagnetic waves in the visible, infrared, and ultraviolet spectral ranges. Optics describes the properties of light and explains the phenomena associated with it. Optical methods are used in many applied disciplines, including electrical engineering, physics, and medicine.

Optics Formulas:
- Absolute refractive index
- Relative refractive index
- The law of refraction
- Thin lens formula
- Optical power of the lens
- Optical path length
- Optical travel difference
- The condition of interference
- Optical travel difference in thin films
- The width of the interference fringes in Jung's experiment
- The condition of the main maxima of the diffraction grating
- Resolution of the diffraction grating
- Malus Law
- Relationship of natural light intensity
- The dispersion of the substance
- Average variance
- Group speed of light
- Phase speed of light