Physics Review QuestionUnit:
lensesYear:
1997 Question#:
92Question:
Based your answers to questions 92 and 93 on the information below.A crown glass converging lens has a focal length of .10 meter. Which cross-section diagram best represents this lens? (1
) (2
) (3
) (4
) What is this question really asking?
Explanation by: Weirui Z. [ Return to question menu
]Answer 1
INCORRECT A lens that is thinner in the middle would diverge light rather than converge it. It behaves in this way: From the diagram it is easy to see that the focal length of the above diverging lens is negative. return to top
Answer 2
INCORRECT A lens that is thinner in the middle would diverge light rather than converge it. It behaves in this way: ` From the diagram it apparent that the focal length of the above diverging lens is negative. return to top
Answer 3
INCORRECT This lens wil not diverge or converge light. It has no focal point. return to top
Answer 4
CORRECT A converging lens is fatter in the middle than at the edges. The lens will bend light in this way: This is the only choice with a positive focal length. return to top
What's this question really asking?
How is a converging lens shaped? What kind of lens has a positive focal length? return to top |

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