1.What is the radius of the spherical surface from which the mirror was made?

2.If you look at yourself in a shiny Christmas tree ball with a diameter of 9.6 cm when your face is 30.0 cm away from it, where is your image?

3.A dentist wants a small mirror that, when 2.00 cm from a tooth, will produce a 5.4\times (upright) image.
What must its radius of curvature be?

physics help please?

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