diff --git a/data/chapter_10.png b/data/chapter_10.png
index 1b7517f..d9fb696 100644
Binary files a/data/chapter_10.png and b/data/chapter_10.png differ
diff --git a/raytracing/src/core/intersection-data.cpp b/raytracing/src/core/intersection-data.cpp
index fb3f958..a647019 100644
--- a/raytracing/src/core/intersection-data.cpp
+++ b/raytracing/src/core/intersection-data.cpp
@@ -258,7 +258,7 @@ const double IntersectionData::n2(void) const
 
 /* ------------------------------------------------------------------------- */
 
-double IntersectionData::schlick(void)
+double IntersectionData::schlick(void) const
 {
     double the_cos, the_r0;
 
diff --git a/raytracing/src/core/intersection-data.h b/raytracing/src/core/intersection-data.h
index ca18735..5e0e802 100644
--- a/raytracing/src/core/intersection-data.h
+++ b/raytracing/src/core/intersection-data.h
@@ -78,7 +78,7 @@ namespace Raytracer
         void set_n2(double an_n2);
         const double n2(void) const;
 
-        double schlick(void);
+        double schlick(void) const;
 
     private:
         bool m_is_inside;
diff --git a/raytracing/src/renderer/world.cpp b/raytracing/src/renderer/world.cpp
index 625328a..6f8451d 100644
--- a/raytracing/src/renderer/world.cpp
+++ b/raytracing/src/renderer/world.cpp
@@ -167,8 +167,17 @@ Color World::shade_hit(const IntersectionData &an_intersection_data, uint32_t a_
     Shape *the_object = an_intersection_data.object();
     Color the_surface = the_object->material().lighting(the_object, m_light, an_intersection_data.over_point(),
                                                         an_intersection_data.eyev(), an_intersection_data.normalv(), the_shadowed);
+
     Color the_reflected = reflected_color(an_intersection_data, a_remaining);
     Color the_refracted = refracted_color(an_intersection_data, a_remaining);
+
+    Material &the_material = an_intersection_data.object()->material();
+    if ((the_material.reflective() > 0) && (the_material.transparency() > 0))
+    {
+        double the_reflectance = an_intersection_data.schlick();
+        return the_surface + (the_reflected * the_reflectance) + the_refracted * (1 - the_reflectance);
+    }
+
     return the_surface + the_reflected + the_refracted;
 }