On a sunny day, the blackboard sometimes reflects light and can't be seen clearly, because it is smooth, and the light hitting it is close to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

On a sunny day, the blackboard sometimes reflects light and can't be seen clearly, because it is smooth, and the light hitting it is close to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _. Mirror surface; Strong; Men; faint

Test analysis: A beam of parallel light shines on the smooth surface of an object, and after reflection, its reflected light is still parallel. This kind of reflection is called specular reflection, and a beam of parallel light shines on the rough surface of the object. After reflection, the reflected light is no longer parallel, but points in all directions. This reflection is called diffuse reflection. Because the blackboard is smooth, and the light incident on it is close to specular reflection, the light ratio incident on students' eyes in a certain direction is strong, while the chalk characters are rough, and the light incident on it is diffuse reflection. The light incident on students' eyes in this direction is very weak, which makes them feel a little dazzling and unable to read clearly.

Comments: This topic investigates the influence of specular reflection and diffuse reflection on people's observation of objects. Please note that both of these reflections follow the law of light reflection.