Sixth graders use zoom lenses to observe meal worms and draw them from three different zoom levels. They complete their artwork in sketchbook and complete a questionnaire about their abilities as scientific artists.

At this site from Georgia State University Physics Department the operation of a telephoto lens is discussed. The refraction of light through the lens is shown and a link to a calculation page is provided.

Video 101 is a fascinating introduction to television production--an impressive collection of engaging, interactive lessons with plenty of example video clips to explain concepts. This chapter on Camera Lenses examines telephoto and wide...