Differences between convex and concave lens
May 5, 2018
S.N | Convex lens | Concave lens |
1. | It is thick in the middle but thin at the edges. | It is thin in the middle but thick at the edges. |
2. | It converges the parallel rays of light falling on it. | It diverges the parallel rays of light falling on it. |
3. | It has a real focus. | It has a virtual focus. |
4. | The image formed can be real, virtual, enlarged or diminished based upon the position of object. | The image formed is always virtual, upright and diminished. |
5. | It is also known as converging lens. | It is also known as diverging lens. |
6. | Focal length is positive. | Focal length is negative. |
7. | It is used to correct Hyperopia (farsightedness). | It is used to correct Myopia (nearsightedness). |
8. | Convex means “curved or rounded like the outside of sphere”. | Concave means “hollowed or rounded”. |
9. | It is used in eye, camera, overhead projector, focus sunlight, magnifying glasses, simple telescope, etc. | It is used in glasses, spy holes in door, some telescopes, back windows of some coaches, etc. |
10. |
References:
i) https://dewwool.com/difference-between-the-concave-and-convex-lens/
ii) http://www.passmyexams.co.uk/GCSE/physics/concave-lenses-convex-lenses.html