| Convex lens | Concave lens |
| 1. Objects appear to be big in the lens. | 1. Objects appear to be shrink in the lens. |
| 2. It generally forms real image, (except object is placed between optical centre and focal point) | 2. It always forms virtual image. |
| 3. Light rays tend to converge after refraction from lens. | 3. Light rays tend to diverge from lens after refraction. |
| 4. The image due to lens may be enlarged or same size or diminished. | 4. The image is always diminished. |
| 5. The image due to lens may be inverted or erect. | 5. The image is always erect. |
| 6. It is used to correct hypermetropia. | 6. It is used to correct myopia. |
