While looking at her image in a cosmetic mirror, Dina notes that her face is hig

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 40.0 cm from the mirror, and then inverts when she is beyond 40.0 cm. Based on these observations, answer the following questions about the mirror.

(a) What type of mirror does Dina have? convex concave

(b) What is the focal length of the mirror?__ cm

(c) What is the radius of curvature of the mirror? __cm

Explanation / Answer

(a)Concave

(b)Her image gets inverted beyond 40 cm

Hence focal length = 40cm

(c)Radius of curvature = 40*2 = 80 cm

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