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Integrated Coordinated Science for the 21st Century

Active Physics
+ Chapter 4
Let Us Entertain You
Answers
For You To Do
  1. Student activity.
  2. Find some way to support the glass rod, such as with the optional stopper, test-tube holder and ring stand (or the rod can be taped to a stack of books).
  3. Student activity. Support the mirror, perhaps with a stack of books.
  4. a) It reflects back along the normal.
  5. a) The beam reflects but not along the normal.
    b) Encourage students to look straight down to avoid parallax.
  6. Student activity.
  7. See drawing in Background Information. The angles should be equal.
  8. a - c) The angle of incidence is (approximately) equal to the angle of reflection.
    d) The extended rays intersect in the same place (or nearly so).
    e) See drawing of extended rays in Background Information above.
  9. a) The position of the reflection is behind the mirror. It is the same distance behind the mirror that the object was in front of the mirror.
  10. a - b) The letters that are closest to the mirror make reflections that look closest to the mirror. The letters that are farthest from the mirror make reflections that are farthest from the mirror. Moreover, within a letter, the part of letter closer
    to the mirror makes a reflection closer to the mirror than the rest of the letter.
    c) Student diagrams will differ.
  11. Student activity.
  12. a) Three (one is behind each mirror, as before; the third image is behind the corner where the mirrors meet).
    b) As the angle between the mirrors reduces, the number of reflections increases.