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An object 6 cm in size is paced 20 cm in...

An object 6 cm in size is paced 20 cm in front of a spherical mirror. If the image is formed at 4 cm to the rear of the mirror, calculate its focl length. Is the mirror convex or concave? What is nature of image?
the positive sign of the focal length shows that the mirror is convex, since the image is formed behind the mirror, it is virtual and erect.

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