Magnifying Glasses
- If the object is placed closer to the lens than the focal length, the emerging rays diverge and a real image is no longer formed
- When viewed from the right-hand side of the lens, the emerging rays appear to come from a point on the left
- This point can be found by extending the rays backwards (creating virtual rays)
- A virtual image will be seen at the point where these virtual rays cross
A Lens Close to an Object Forms a Magnified Image
A virtual image is formed by the divergence of rays from a point
- In this case the image is:
- Virtual
- Enlarged
- Upright
- Using a lens in this way allows it to be used as a magnifying glass
- When using a magnifying glass, the lens should always be held close to the object