Index: /trunk/Mars/msimreflector/MFresnelLens.cc
===================================================================
--- /trunk/Mars/msimreflector/MFresnelLens.cc	(revision 19604)
+++ /trunk/Mars/msimreflector/MFresnelLens.cc	(revision 19605)
@@ -189,7 +189,7 @@
 
     // u: incoming direction (normalized!)
-    // n: normal vector of surface
-    // n2: refractive index of new(?) medium
-    // n1: refractive index of old(?) medium
+    // n: normal vector of surface (pointing into direction of change of refractive index)
+    // n1: refractive index of old medium
+    // n2: refractive index of new medium
 
     // V_refraction = r*V_incedence + (rc - sqrt(1- r^2 (1-c^2)))n
@@ -285,5 +285,5 @@
     // Normal vector of the surface at the hit point
     // FIXME: Surface roughness?
-    TVector3 norm;
+    TVector3 norm;;
     norm.SetMagThetaPhi(1, g.fTheta-TMath::Pi()/2, p.XYvector().Phi());