💬 Please note that the ray AD gets reflected back along the same...

Title: Please note that the ray AD gets reflected back along the same path because it falls normally (or perpendicularly) on the mirror surface at point D. Please note that if a ray of light is incident on a convex mirror along its principal axis, then it is reflected back along the same path (because it will be normal or perpendicular to the mirror surface). The angle of incidence as well as the angle of reflection for such a ray of light will be zero. Rule 3. A ray of light going towards the focus...
Full Transcript: Please note that the ray AD gets reflected back along the same path because it falls normally (or perpendicularly) on the mirror surface at point D. Please note that if a ray of light is incident on a convex mirror along its principal axis, then it is reflected back along the same path (because it will be normal or perpendicular to the mirror surface). The angle of incidence as well as the angle of reflection for such a ray of light will be zero. Rule 3. A ray of light going towards the focus of a convex mirror becomes parallel to the principal axis after reflection. This is just the reverse case of the first rule and it is shown in Figure 47. Here the incident ray of light AE is going towards the focus F of the convex mirror. It strikes the mirror surface at point E and gets reflected. After reflection, it becomes parallel to the principal axis and goes in the direction EG (see Figure 47). Rule 4. A ray of light which is incident at the pole of a convex mirror is reflected back making the same angle with the principal axis. This is shown in Figure 48. Here a ray of light AP is incident on the pole P of the convex mirror making an angle of incidence i with the principal axis XP. It gets reflected along the direction PH making an equal angle of reflection r with the principal axis (see Figure 48). It should be noted that a convex mirror has its focus and centre of curvature behind it.
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Please note that the ray AD gets reflected back along the same path because it falls normally (or perpendicularly) on the mirror surface at point D. Please note that if a ray of light is incident on a convex mirror along its principal axis, then it is reflected back along the same path (because it will be normal or perpendicular to the mirror surface). The angle of incidence as well as the angle of reflection for such a ray of light will be zero. Rule 3. A ray of light going towards the focus...