An object of height \( 3 \mathrm{~cm} \) is kept at a distance of 30 \( \mathrm{cm} \) from a co...

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An object of height \( 3 \mathrm{~cm} \) is kept at a distance of 30 \( \mathrm{cm} \) from a concave mirror. A real image is formed \( 60 \mathrm{~cm} \) from the mirror. Calculate the focal length of the mirror and the size of the image.
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