Hougang Sec 14 Light Worksheet (Pure Physics)

1 Hougang Secondary School SEC 3/4 PURE PHYSICS 14 Light – Excluding Total Internal Reflection WORKSHEET 1 Steps for Drawing a Ray Diagram Draw the Ray Diagram for Figure 1. Figure 1

2 1 Tom, who is 1.5 m tall, wants to mount a mirror on a wall so that he can get a full view of himself. What is the minimum vertical length of the mirror that is needed? 2 Fill in the blanks.

3 4 (a) The following shows a small object in front of a vertical plane mirror. On the diagram: (i) Mark with a clear cross, labelled I, where the image of the object is located; (ii) Draw the path of a ray from the object to point P on the mirror, and its path after the ray is incident on the mirror; and (iii) Mark clearly the angle of incidence i and the angle of reflection r at P. (b) When we look into the mirror, we see an image of our face. State two characteristics of the images we see. ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… (c) If we look into a thick glass window in a brightly lit room when it is dark outside, we can see two images of our face. Suggest why there are two images. ……………………………………………………………………………………………………………… ………………………………………………………………………………………………………………