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Mirror Question Physics help?

A piece of thin spherical shell that has a radius of curvature of 100 cm is silvered on both sides. The concave side of the piece forms a real image 75 cm from the mirror. The piece is then turned around so that its convex side faces the object. The piece is moved so that the image is now 35 cm from the piece on the concave side. How far was the mirror moved?

The mirror was not moved. The spherical shell is the only moveable piece.

Make Glass Mirrors with Silver Nitrate

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