## Physical Quantities and Their Units

List of important physical quantities, their symbols, (derived) units and examples with images.

Learn how light can be described as a ray or wave and how you manipulate light with lasers and optical lenses.

List of important physical quantities, their symbols, (derived) units and examples with images.

Learn about important physical constants and what their formula symbols and SI units are.

` $$ \varphi ~=~ \varphi_{\text r} $$ `

Here we derive the double-slit formula, which you can use, for example, to find the wavelength of light using a double-slit experiment.

` $$ \nu ~=~ \frac{1}{\lambda} $$ `

` $$ k ~=~ 2\pi \, \nu $$ `

` $$ k ~=~ \frac{2\pi}{\lambda} $$ `

` $$ d_{\text{min}} ~=~ 0.61 \,\cdot\, \frac{\lambda}{n \, \sin(\varphi)} $$ `

` $$ \alpha_{\text c} ~=~ \arcsin\left( \frac{n_2}{n_1} \right) $$ `

` $$ n_1 \, \sin(\alpha_1) ~=~ \sin(\alpha_2) \, n_2 $$ `

Here you will learn about polarized light, i.e. linearly or circularly polarized electromagnetic waves, and what characterizes them.