Created a testing skybox and got the reflection and refraction working.

24-cubemaps/shaders/24-frag.glsl

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+#version 330 core
+out vec4 FragColor;
+
+in vec3 Normal;
+in vec3 FragPos;
+in vec2 TexCoords;
+
+uniform vec3 cameraPos;
+uniform samplerCube skybox;
+
+void main()
+{
+  float ratio = 1.0/1.52;
+  vec3 I = normalize(FragPos - cameraPos);
+  vec3 R = refract(I, normalize(Normal), ratio);
+  FragColor = vec4(texture(skybox, R).rgb, 1.0);
+}

24-cubemaps/shaders/24-vert.glsl

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+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+out vec3 Position;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+  Normal = mat3(transpose(inverse(model))) * aNormal;
+  FragPos = vec3(model * vec4(aPos, 1.0));
+  gl_Position = projection * view * vec4(FragPos, 1.0);
+  TexCoords = aTexCoords;
+}