Final answer:
When light passes through a glass fragment, it changes direction and becomes concentrated, creating a bright line called the Becke line. The refraction of light is determined by the refractive index of the material.
Step-by-step explanation:
When light passes through a glass fragment, it can change direction and become concentrated. This phenomenon is known as refraction. As the light passes from one medium (such as air) to another medium (such as glass), its speed changes, causing the light to bend.
The refraction of light is determined by the refractive index of the material. The refractive index is a measure of how much the speed of light is reduced when passing through a medium. In the case of a glass fragment, the refractive index of the glass determines how much the light bends as it enters and exits the fragment.
As the refracted light becomes concentrated around the glass fragment, it creates a bright line called the Becke line. The Becke line can be used to determine the refractive index of the glass and identify its characteristics.
Learn more about Refraction of light