The discussion revolves around the concept of net deviation of a ray after reflection, specifically focusing on ray A's deviation in a counterclockwise direction after one reflection and emergence. The problem is situated within the context of optics and geometric reflection.
Some participants express uncertainty about the concept of net deviation and seek clarification. Others attempt to relate their understanding of deviation angles to the specific scenario presented, indicating a mix of exploration and inquiry without reaching a consensus.
There is mention of a lack of understanding regarding the term "net deviation," and participants are encouraged to consider the geometry involved in the reflection process. The original poster has not yet attempted a solution, and the discussion includes references to relevant equations and concepts that may not directly apply to the problem at hand.
Ok, but that won't help here. It is purely a matter of geometry.Eddie10 said:
If something changes the direction of a ray the ray is said to have been deviated. The extent of the deviation is the angle (measured anticlockwise) by which the direction has changed. So if a ray strikes a mirror along the normal it will be deviated 180 degrees. If it strikes it at 30 degrees to the normal it will be deviated by either 120 degrees or 240 degrees.Eddie10 said:
Suppose the ray starts left to right at 30 degrees above the horizontal and strikes a vertical mirror. The reflection will go right to left, still at 30 degrees above horizontal. If you take the path of the ray as it is about hit the mirror and rotate it anticlockwise until it matches the path just after reflection from the mirror, what angle do you rotate the ray by?Eddie10 said: