Which of the following statements is not true about refraction?
Refraction occurs when light's velocity changes.
The angle between the refracted ray and the normal is called the angle of refraction.
When light moves from a rarer to a denser medium, it bends toward the normal.
The path of a light ray that crosses the boundary between two different media is irreversible.
The path of a light ray that crosses the boundary between two diff. media is irreversible
In order to determine which statement is not true about refraction, we need to evaluate each statement and identify any inaccuracies.
1. Refraction occurs when light's velocity changes.
This statement is true. Refraction is the bending of light as it passes from one medium to another, such as from air to water. This bending occurs due to the change in the speed of light in different media.
2. The angle between the refracted ray and the normal is called the angle of refraction.
This statement is true. The angle at which a light ray is bent when it enters a new medium is called the angle of refraction. The angle of refraction is measured between the refracted ray and the normal, which is perpendicular to the surface of separation between the two media.
3. When light moves from a rarer to a denser medium, it bends toward the normal.
This statement is also true. When light travels from a rarer (less optically dense) to a denser (more optically dense) medium, it slows down and bends toward the normal. This can be observed, for example, when light passes from air to glass.
4. The path of a light ray that crosses the boundary between two different media is irreversible.
This statement is not true. The path of a light ray that crosses the boundary between two different media is reversible. When light passes through the boundary, its path is bent, but when it exits the medium and returns to the original medium, it follows the same path in the opposite direction, resulting in minimal or no net deviation.
Therefore, the statement that is not true about refraction is: "The path of a light ray that crosses the boundary between two different media is irreversible."