Questions for Week Three—Reflection
and refraction
Write well-reasoned verbal answers
to these questions. You should be able to find the base for your answer in the
week’s readings, but the questions are not directly answered there. You have to
think them out, using the facts and concepts from the reading. Calculations are
not necessary, though if you find it useful, include them by all means. Make
sure your prose is clear and complete. One or two paragraphs should be enough
for each question.
(1)
Is your image in an ordinary room mirror a real image or a
virtual image?
Is the image seen in an ordinary magnifier lens a real image or a virtual image?
Is the image formed by a camera lens
on the film (or digital recording surface) a real image or a virtual image?
Explain each situation.
(2) The ray-tracing diagram in the reading (Figure 4-10) shows where light from the tip of an arrow ends up after passing through a thin lens, namely at an image point (A¹ in the diagram). Using this diagram as a model, locate where the light from the base and from the mid-point of the arrow end up.
(3) What is wrong with Figure 4-7A? Explain.
(4) Is a camera more like a slide projector or a telescope?
(5) Would an ordinary camera work underwater, assuming one had waterproof film? What about a pinhole camera?