when an object is placed at 15cm in front of a concave mirror the image is also formed at the same position of the object.find the focal length of the mirror?
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Answer:
7.5cm
Explanation:
If the image formed is at same position as the object by a concave mirror then the object must be placed at C(centre of curvature).
Therefore, C=15cm
f=C/2=15/2=7.5cm
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