||In figures (a) and (b), the front and back surfaces are parallel to each other
at the center of the lens. What will happen to a ray that enters near the center,
but not necessarily along the axis of the lens?
||Suppose you wanted to change the setup in figure (a) so that the location of
the actual flame in the figure would instead be occupied by an image of a
flame. Where would you have to move the candle to achieve this? What about
||There are three qualitatively different types of image formation that can
occur with lenses, of which figures (a) and (b) exhaust only two. Figure out
what the third possibility is. Which of the three possibilities can result in a
magnification greater than one?
||Classify the examples shown in figure (c) according to the types of images
delineated in the previous discussion question.
||n figures (a) and (b), the only rays drawn were those that happened to
enter the lenses. Discuss this in relation to figure (c).
||In the right-hand side of figure (c), the image viewed through the lens is in
focus, but the side of the rose that sticks out from behind the lens is not. Why?
||In general, the index of refraction depends on the color of the light. What
effect would this have on images formed by lenses?