Lists and Dummy guides of useful stuff are always great. Lists of formulas and equations are educational as well.

Here is the first list of top Equations, powered by the fxSolver team.

Behold, the Top 10 Optics equations.

1. **Snell’s law**

It is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass and air.

2. **Refractive Index**

The refractive index or index of refraction of a substance is a dimensionless number that describes how light, or any other radiation, propagates through that medium. The refractive index determines how much light is bent, or refracted, when entering a material.

3. **Thin lens formula**

Also known as Image location formula. It basically sais that if the distances from the object to the lens and from the lens to the image are S1 and S2 respectively, for a lens of negligible thickness, in air, the distances are related to the length of the focus of the lens.

4. **Periodic Wavelength**

It is used for other kinds of waves as well. In linear media, any wave pattern can be described in terms of the independent propagation of sinusoidal components. The wavelength λ of a sinusoidal waveform traveling at constant speed v is given by this equation.

5. **Frequency**

This equation couldn’t be absent from this list. Frequency is the number of occurrences of a repeating event per unit time.It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency.

6. **Polarization angle – Brewster’s angle**

The angle of incidence at which light with a particular polarization is perfectly transmitted through a transparent dielectric surface, with no reflection. When unpolarized light is incident at this angle, the light that is reflected from the surface is therefore perfectly polarized.

7. **Parallax**

Apart from the fact that Parallax is an awesome supervillain name, is also a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

8. **Magnification of the telescope**

The angular magnification of the telescope is related to the focal length of the objective lens and the focal length of the eyepiece. Optical magnification is the ratio between the apparent size of an object and its true size, and thus it is a dimensionless number.

9. **Depth of field**

In optics, particularly as it relates to film and photography, depth of field is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. (You can find a more detailed blog post about the Depth of field here)

10. **Malu’s law**

This equation describes the intensity of the light that passes through a perfect polarizer when it is placed in a polarized beam of light.

A full list of Optics formulas in fxSolver’s database can be found **here.**

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