Physics > Refraction of Light > 4.0 Thin lenses
Refraction of Light
1.0 Introduction
2.0 Laws of refraction
3.0 Apparent shift of an object
4.0 Thin lenses
4.1 Sign convention
4.2 Some important terms
4.3 Ray tracing
4.4 Image formed by covex lens
4.5 Image formed by concave lens
5.0 Lens makers formula & Other Functions of lens.
5.1 Thin Lens Formula
5.2 Magnification and Power of lens
5.3 Combination of lenses
5.4 Displacement method to find focal length.
5.5 Silvering of lens
6.0 Total internal reflection
7.0 Refraction through prism
8.0 Scattering of light
9.0 Optical instruments
9.1 Spectrometer
9.2 Simple microscope
9.3 Compound microscope
9.4 Astronomical telescope (Refracting type)
9.5 Terrestrial telescope
9.6 Galileo's terrestrial telescope
9.7 Reflecting type telescope
4.4 Image formed by covex lens
4.2 Some important terms
4.3 Ray tracing
4.4 Image formed by covex lens
4.5 Image formed by concave lens
5.2 Magnification and Power of lens
5.3 Combination of lenses
5.4 Displacement method to find focal length.
5.5 Silvering of lens
9.2 Simple microscope
9.3 Compound microscope
9.4 Astronomical telescope (Refracting type)
9.5 Terrestrial telescope
9.6 Galileo's terrestrial telescope
9.7 Reflecting type telescope
| S. No. | Position of object | Ray diagram | Position of Image | Nature of image | Size of image |
| 1. | Between infinity and $2F$ |
| Between $F$ and $2F$ | Real and inverted | Diminished |
| 2. | At $2F$ |
| At $2F$ | Real and inverted | Same size |
| 3. | Between $2F$ and $F$ |
| Between $2F$ and infinity | Real and inverted | Magnified |
| 4. | At the focus $F$ |
| At infinity | Real and inverted | Magnified |
| 5. | Between focus $F$ and optical centre $P$ |
| Between $2F$ and $F$ | Virtual and erect | Magnified |
