# Physics

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A convex mirror has a radius of curvature of 36.0 cm. When a 5.60 cm tall object is placed in front of the mirror, the magnification is 0.250. (a) What is the height of the image? (b) How far is the object from the mirror?

• Physics -

a) Di = (1/4)*5.6 = 1.4 cm

b) Use the equation
1/Do + 1/Di = 1/f = -2/R

Di = -0.25*Do
(A minus sign is needed for Di since the mirror is convex and the image is virtual)

1/Do -4/Do = -3/Do = -1/18

Do = 54 cm
Di = -13.5 cm

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