Images formed by Convex Lens
| Position of object | Position of image | Nature of image |
|---|---|---|
| At infinity | At focus | Real, diminished, inverted |
| At 2F | At 2F | Real, same size and inverted |
| Between 2F and F | Beyond 2F | Real, enlarged, inverted |
| At F | No image | Refracted rays are parallel |
| Between F and lens | On the same side as the object | Virtual, enlarged and upright |
Uses of Convex Lens
- Used in magnifying glass.
- Used to correct the vision of long-sighted persons.
Images formed by Concave Lens
| Position of object | Position of image | Nature of image |
|---|---|---|
| At infinity | At focus | Virtual, diminished, upright |
| Between infinity and F | Between the object and the lens | Virtual, diminished, upright |
Uses of Concave Lens
- Used in spy holes on doors to check the visitors.
- Used to correct the vision of short-sighted persons.