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science A concave mirror has a focal length of 15 cm. Where should an object be placed to get an image at 30 cm in front of the mirror?A concave mirror has a focal length of 15 cm. Where should an object be placed to get an image at 30 cm in front of the mirror?A concave mirror has a focal length of 15 cm. Where should an object be placed to get an image at 30 cm in front of the mirror?
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