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Dead time Useful reference for dead time could be used to improve the article. Physics and radiobiology of nuclear medicine Possible improvements include: More information Addition of paralysable/non-paralysable system graph Graphic display of the effect of the two types of counting systems, showing dead time loss WikiProject Physics Article Assessment feedback Work up a template for article assessment feedback to provide pointers to take it up to the next grade. Brewster's Angle Derivation At a particular angle of incidence, $\theta _{\mathrm {B} }$ (also known as Brewster's angle), the reflectivity, $r_{\parallel }\to 0$. From the Fresnel equation for the reflectivity of a wave with an electric field polarized parallel to the plane of incidence; $r_{\parallel }={\frac {n_{1}\cos \theta _{\mathrm {T} }-n_{2}\cos \theta _{\mathrm {B} }}{n_{1}\cos \theta _{\mathrm {T} }+n_{2}\cos \theta _{\mathrm {B} }}}=0$ where $\theta _{\mathrm {T} }$ is the angle of transmission. From this; $n_{1}\cos \theta _{\mathrm {T} }=n_{2}\cos \theta _{\mathrm {B} }$ Using simple geometry, the condition that the refracted light is perpendicular to the reflected light can be expressed as; $\theta _{\mathrm {B} }+\theta _{\mathrm {T} }=90^{\circ }$ We then obtain; $n_{1}\cos \left({\frac {\pi }{2}}-\theta _{\mathrm {B} }\right)=n_{1}\sin \theta _{\mathrm {B} }=n_{2}\cos \theta _{\mathrm {B} }$ Using trigonometric identities, this rearranges to; ${\frac {\sin \theta _{\mathrm {B} }}{\cos \theta _{\mathrm {B} }}}=\tan \theta _{\mathrm {B} }={\frac {n_{2}}{n_{1}}}$ Ideal gas Incorporate alternative version of ideal gas equation: $P={\frac {\rho RT}{\mu }}$