a small concave mirror has a focal length 15 cm. what is the magnification of image formed by if when the object placed at a distance 30 cm in front of it
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The real and inverted image created by a concave mirror becomes of equal size to the object when both object and images are situated on the centre of curvature.
This means that the object distance is equal to the radius of curvature for the mirror.
Radius of curvature =2× focal length of the mirror.
Given, focal length of the mirror =15cm
So, object distance = radius of curvature =2×15cm=30cm
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