write about the various positions of objects placed in front of a convex lens and the nature of images formed by it. Show them diagrammatically.
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We will now discuss the formation of different types of images by a convex lens when the object is placed .
1. At infinity
2. Beyond 2F
3. At 2F
4. Between F and 2F
5. At the focus F
6. Between the focus F and optical centre C .
1. Image formed by a convex lens when the object is placed at infinity
When the object is placed at infinity, the two rays AO and BD running parallel to the principal axis get refracted at point O and D respectively and intersect each other at the principal focus. Therefore, in this case the image A’B’ is formed at the focus, which is highly diminished (point sized), real and inverted.
1. At infinity
2. Beyond 2F
3. At 2F
4. Between F and 2F
5. At the focus F
6. Between the focus F and optical centre C .
1. Image formed by a convex lens when the object is placed at infinity
When the object is placed at infinity, the two rays AO and BD running parallel to the principal axis get refracted at point O and D respectively and intersect each other at the principal focus. Therefore, in this case the image A’B’ is formed at the focus, which is highly diminished (point sized), real and inverted.
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