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Just-in-Time
Teaching
FIE, October 21,
2005 |
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Question
Please explain in your own words what a focal length is. Try not to use any equations or refer to a specific type of mirror or lens.
Answers
- Depending on the lens or mirror, the focal point is the point where
light converges after being reflected or refracted by/through the medium.
- A focal point is the point where your gaze is "attracted."
In other words, it is the point at which the light rays "come together" or
"come apart."
- All rays of light that enter the lens parallel to the principal axis
converge at a point which is the focal point of the lens
