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Question : 39
Total: 39
A student took three concave mirrors of different focal lengths and performed the experiment to see the image formation by placing an object at different distance with these mirrors as shown in the following table.
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.
| Case No. | Object-distance | Focal length |
|---|---|---|
| I | | |
| II | | |
| III | | |
(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.
Solution:
(a) In case (I), object is beyond C. For concave mirrors, when the object is outside C C F
(b) In case (II), object is at C, so the image formed will be real and of same size.
(c) The dentist holds a small concave mirror in such a way that the tooth lies within its focus. A magnified image of the tooth is then seen by the dentist in the concave mirror. Since the tooth looks much bigger, in the concave mirror it becomes easy for the dentist to examine the defect in the tooth.
OR
(c) We know that when an object is placed betweenP F
forms a virtual and enlarged image. Thus, by using a concave mirror we can have a proper shave, as the tiny hairs are clearly visible.
In case (III) object is between F andP
(b) In case (II), object is at C, so the image formed will be real and of same size.
(c) The dentist holds a small concave mirror in such a way that the tooth lies within its focus. A magnified image of the tooth is then seen by the dentist in the concave mirror. Since the tooth looks much bigger, in the concave mirror it becomes easy for the dentist to examine the defect in the tooth.
OR
(c) We know that when an object is placed between
forms a virtual and enlarged image. Thus, by using a concave mirror we can have a proper shave, as the tiny hairs are clearly visible.
In case (III) object is between F and
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