Final answer:
The question addresses using a protractor to measure angles in optics problems involving reflections in mirrors, with aims to construct ray diagrams and determine image properties.
Step-by-step explanation:
The question involves the concept of reflections and image formation by mirrors, part of the field of geometric optics within physics, although it is being categorized under mathematics due to the measurement aspect using a protractor. To answer the student's question, one would use a protractor to measure angles formed by incident and reflected rays to determine the properties of images created by mirrors. In reference to the descriptions provided, one could deduce that these examples focus on the law of reflection, which states that the angle of incidence is equal to the angle of reflection, and also on constructing ray diagrams to find the positions of images. Tasks like locating images in the case of mirrors inclined at a specific angle, determining image coordinates in parallel mirrors, and calculating magnifications or focal lengths are typical problems in this topic.