an object is placed at a distance of 40cm on the principal axis of a concave mirror of radius of curvature 30 cm. by how much does the image move if the object is shifted towards the mirror through 15cm
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an object is placed at distance of 40 cm on a principle axis of concave mirror of radius of curvature 30 cm. By how much does the mirror does move, if the object is shifted towards mirror through 15 cm
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