\magnification=\magstep1


$$
   \theta =  (1.22 {\rm \ radians}) \thinspace {{\lambda} \over {D}}
$$

$$
   \theta =  {{ 0.13 {\rm\ arcsec}}\over{D ({\rm meters})} }
$$


$$
   \theta =  (70 {\rm \ degrees})  \thinspace {{\lambda} \over {D}}
$$

\bye
