InterviewSolution
Saved Bookmarks
| 1. |
The distance between an object and its upright image is `20 cm.` if the magnification is `0.5,` what is the focal length of the lens that is being used to form the image? |
|
Answer» Correct Answer - C::D Diminished erect image is formed by concave lens. Let `u=-x,` then `v=-x/2` Now, `|u|-|v|=20 cm` `:. x/2=20 cm or x=40 cm` `:. u=-40 cm and v=-20 cm` `1/f=1/-20-1/-40` or `f=-40 cm` |
|