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When an object is placed 200 cm in front of a certain spherical mirror, its image...

When an object is placed 200 cm in front of a certain spherical mirror, its image forms x cm in front of the mirror. If the object is moved 80 cm closer to the mirror, its image is now x + 10 cm in front of the mirror. Calculate the value of x, the focal length f of the mirror, its radius of curvature R, and state whether the mirror is convex or concave.?

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