Distinguish between b. Concave lens and Convex Lens
| Concave lens | Convex lens |
| It is a diverging lens because it diverges the rays falling on it. | It is a converging lens because it converges the rays falling on it. |
| It is thin at the center and bulged at the edge. | It is thin at the edge and bulged at the centre. |
| The image formed by concave lens is always diminished and virtual. | The image formed by convex lens can be real as well as virtual. Also, the image formed can be diminished as well as magnified. |
| It has a virtual focus. | It has a real focus. |