While looking at her image in a cosmetic mirror, Dina notes that her face is hig
ID: 1603178 • Letter: W
Question
While looking at her image in a cosmetic mirror, Dina notes that her face is highly magnified when she is close to the mirror, but as she backs away from the mirror, her image first becomes blurry, then disappears when she is about 36.0 cm from the mirror, and then inverts when she is beyond 36.0 cm. Based on these observations, answer the following questions about the mirror.
(a) What type of mirror does Dina have?
concave or convex
(b) What is the focal length of the mirror?
cm
(c) What is the radius of curvature of the mirror?
cm
Explanation / Answer
Ans
a) Is a concave mirror. Only concave mirrors can invert images.
b) The Focal Lenght is equal to the distance where no image is formed, so its focal lenght is 36 cm
c) The radius of the curvature is twice the focal lenght for a spherical mirror. In this case, the radius is 72 cm.
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