level: thin converging lens
Questions and Answers List
level questions: thin converging lens
| Question | Answer |
|---|---|
| what are convex (converging lens) | makes parralel rays coverage to a principle focus |
| what are concave (diverging) lens | makes parallel rays diverge (spread out) used in glasses to correct short sightedness |
| what is the focal length | the distance between the centre of the lens and its point of focus |
| what is the principle focus | the point where parallel rays meet after they pass through a lens |
| real image | an image that can be formed on a screen |
| virtual image | an image that can't be formed on a screen |
| if an image is formed after the lens.. | it is real |
| if an image is formed before the lens..... | its is virtual |