Question

Draw the geometry of a concave mirror ?​

Answer 1

Projectile parabolic path :

$\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\put(0,-1){\vector(0,1){5}}\put(-1,0){\vector(1,0){8}}\qbezier(0,0)(3,5)(6,-0)\multiput(3,0)(0,0.38){7}{\qbezier(0,0)(0,0)(0,0.2)}\put(3.4,1){\bf H}\put(3,-0.7){\bf R}\put(2.8,-0.6){\vector(-1,0){2.7}}\put(3.5,-0.6){\vector(1,0){2.6}}\put(0,0){\vector(1,2){1}}\put(1.1,2.3){\bf\large u}\end{picture}$