Question

what does letter d represent in the following diagram?
match each letter to the proper description for a light ray travelling from air into glass.
ray of reflection
ray of incidence
ray of refraction
normal
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Explanation:

• Ray of reflection: A ray that bounces off a surface. In the context of light traveling from air to glass, the reflected ray would be on the same side (air - side) as the incident ray and follow the law of reflection (angle of incidence = angle of reflection). But in the given diagram (though not fully visible in text - based description, but going by standard ray - diagram conventions), \(D\) is not the reflected ray.
• Ray of incidence: The incoming ray of light. Usually, it is the ray that approaches the interface (air - glass interface in this case). \(D\) is not the incident ray as per standard ray - diagram set - up.
• Ray of refraction: When light travels from one medium (air) to another (glass), the ray that bends (refracts) as it enters the second medium. But \(D\) is not the refracted ray.
• Normal: A line perpendicular to the interface (air - glass interface) at the point of incidence. In a typical ray - diagram for refraction (light going from air to glass), the normal is a straight line perpendicular to the boundary. If \(D\) is a straight line perpendicular to the air - glass boundary (as per the general set - up of such diagrams), then \(D\) represents the normal.

Answer:

normal