Note down your observations in table-1.
| sl.no | Distance of candle from mirror(object distance-u) | Distance of paper from mirror (image distance-v) | Enlarged/ diminished | Inverted orerect |
|---|---|---|---|---|
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 |
Group your observations based on the type of image you see (e.g. Image is bigger and inverted). It is possible you may not get any image at some positions, note down that too!
Since we know the focal point and centre of curvature, we can reclassify our above observations as shown in table-2. What do you infer from this table?
At this point we suggest that you make one more observation. You have been trying to get the image on a paper when the object is at different positions. At the same time also look into the mirror and note your observations about how the image appears.
• Is it inverted or erect, enlarged or diminished?
| Position of the candle (object) | Position of the image | Enlarged/ diminished | Inverted or erect | Real or virtual |
|---|---|---|---|---|
| Between mirror & F | ||||
| At focal point | ||||
| Between F and C | ||||
| At centre of curvature | ||||
| Beyond C |
What do you infer from the table-2?
Let us try to draw ray diagrams with concave mirrors and compare them with your inferences.
In activity-5 we saw the ray diagram of sunrays parallel to the concave mirror and the image of the sun was very small at the focal point (See