A bigger lens
In the figure shown below, point O is a source of light. Two rays from O are shown passing through a thin converging lens and crossing each other at the point marked C.
- On a copy of the figure on your answer sheet, find the two principal foci of the lens by drawing appropriate rays. Label the foci F1 and F2. Explain your reasoning.
- Suppose the lens is replaced by another lens having the same focal length but a larger diameter.
For each of the following partial sentences, indicate whether they are correctly completed by the phrase greater than (>), less than (<), or the same as (=).
- The distance of the image from the principal axis is _________ it was with the smaller lens.
- The brightness of the image with the large lens is _________ it was with the smaller lens.
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Page last modified
November 5, 2002: OP20