<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">
\magnification=\magstep2


$$
\int_{\lambda_1}^{\lambda_2} { F_{\lambda} {d \lambda} } \quad =
     \quad 
    \int_{{c}\over{\lambda_2}}^{{c}\over{\lambda_1}} { F_{\nu} {d \nu} }
$$

$$
    F_{\nu} \quad = \quad { \left( {{\lambda^2}\over{c}} \right) F_{\lambda}  }
$$

$$
   B_{\nu}(T) \thinspace = \thinspace {   {{{2 h \nu^3} / c^2 }} \over
                            { {e^{ {h \nu} /{kT}} } }   - 1 }
  \quad , \quad
   B_{\lambda}(T) \thinspace = \thinspace {   {{{2 h c^2 } / {\lambda}^5 }} \over
                            { {e^{ {h c} /{\lambda kT}} } }   - 1 }
$$


$$
  {\rm 1\ Jansky} \quad \equiv \quad 10^{-26} \thinspace
                  {\rm {{ Watt }\over{meter^2 \thinspace \thinspace Hz}} }
$$
\bye
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