矩形ABCD内两点M、N,点M经过矩形的边反弹后撞击到点N,分别画出点M经AD一边反弹、经AD,DC两边反弹、经AD,DC,CB三边反弹后撞击到点N的线路图.---**Question Stem:** 1.【☆】矩形ABCD内两点M、N,点M经过矩形的边反弹后撞击到点N,分别画出点M经AD一边反弹、经AD,DC两边反弹、经AD,DC,CB三边反弹后撞击到点N的线路图. **Diagram 1 Description:** * **Type:** Geometric diagram illustrating reflection. * **Main Elements:** * A rectangle labeled ABCD with vertices A (top-left), B (bottom-left), C (bottom-right), D (top-right). * Point M located inside the rectangle. * Point N located inside the rectangle. * Point U located on side AD. * A solid line segment connecting M to U. * A solid line segment connecting U to N. * A dashed line segment M'U, where M' is a point outside the rectangle, positioned such that M' is the reflection of M across the line containing AD. * The points M', U, and N appear to be collinear, forming a straight line from M' to N that intersects AD at U. * This diagram illustrates the path of a light ray or bouncing object from M to N after reflecting off side AD. **Diagram 2 Description:** * **Type:** Geometric diagram illustrating double reflection. * **Main Elements:** * A rectangle labeled ABCD with vertices A (top-left), B (bottom-left), C (bottom-right), D (top-right). * Point M located inside the rectangle. * Point N located inside the rectangle. * Point U located on side AD. * Point V located on side DC. * A solid line segment connecting M to U. * A solid line segment connecting U to V. * A solid line segment connecting V to N. * A dashed line segment M'U, where M' is a point outside the rectangle, positioned such that M' is the reflection of M across the line containing AD. * A dashed line segment VN', where N' is a point outside the rectangle, positioned such that N' is the reflection of N across the line containing DC. * The points M', U, V appear to be collinear. * The points U, V, N' appear to be collinear. * This diagram illustrates the path of a light ray or bouncing object from M to N after reflecting off side AD, then off side DC. **Diagram 3 Description:** * **Type:** Geometric diagram illustrating triple reflection. * **Main Elements:** * A rectangle labeled ABCD with vertices A (top-left), B (bottom-left), C (bottom-right), D (top-right). * Point M located inside the rectangle. * Point N located inside the rectangle. * Point U located on side AD. * Point V located on side DC. * Point G located on side CB. * A solid line segment connecting M to U. * A solid line segment connecting U to V. * A solid line segment connecting V to G. * A solid line segment connecting G to N. * A dashed line segment M'U, where M' is a point outside the rectangle, positioned such that M' is the reflection of M across the line containing AD. * A dashed line segment VN', where N' is a point outside the rectangle, positioned such that N' is the reflection of N across the line containing DC. * A dashed line segment GN'', where N'' is a point outside the rectangle, positioned such that N'' is the reflection of N' across the line containing CB. * The points M', U, V appear to be collinear. * The points U, V, N' appear to be collinear. * The points V, G, N' appear to be collinear (implied by construction logic, though not explicitly labeled as such, the path V-G-N seems to be related to N'). More accurately, the points V, G, N'' appear to be collinear, indicating N'' is derived from N. N'' is the reflection of N' across CB. * This diagram illustrates the path of a light ray or bouncing object from M to N after reflecting off side AD, then off side DC, then off side CB. **Other Relevant Text:** 【简释】如图,作出 M、N 各自对应对称点