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Question
With the help of a labelled ray diagram, describe how a converging mirror can be used to give an enlarged upright image of an object.
Solution
A concave mirror gives an enlarged and upright image when an object is placed between the pole and the focus (object between P and F):
In the diagram, AB is the object and A'B' is the virtual and magnified image of AB.
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| Case No. | Object-distance | Focal length |
| I | 45 cm | 20 cm |
| II | 30 cm | 15 cm |
| III | 20 cm | 30 cm |
Now answer the following questions:
(a) List two properties of the image formed in Case I.
(b) In which one of the cases given in the table, the mirror will form real image of same size and why?
(c) Name the type of mirror used by dentists. Given reason why do they use such type of mirrors.
OR
(c) Look at the table and identify the situation (object distance and focal length) which resembles the situation in which concave mirrors are used as shaving mirrors? Draw a ray diagram to show the image formation in this case.
