Q22 of 30 Page 1

It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm.

(i) What should be the range of the object distance in the above case?


(ii) Will the image be smaller or larger than the object? Draw a ray diagram to show the formation of image in this case.


(iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror?


(i) Concave mirror forms erect image when, the object is placed between pole and focus. Given the focal length of the mirror is 12cm. Hence, the object should be placed at a distance less than the focal length i.e. 12cm.


(ii) Here the image formed will be larger than the object as shown in the fig. below



(iii) When the object is at a distance of 24 cm which is the approx. position of center of curvature, then the same image forms without change in the position as shown in fig. below



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