Concave Examples Case 1: A child who is 4 cm tall is standing 9 cm from a concave mirror with a focal length of 4 cm. Di Hi M M = hi/ho M = -di/do 1//f =1/do + 1/di -.8 = hi/4 M = -7.2/9 ¼ - 1/9 = 1/di (-.8)(4) = hi M = -.8 9/36 – 4/36 = 1/di -3.2 = hi 5/36 = 1/di 36/5 = di/1 7.2 = di RAY DIAGRAM
Concave Examples Case 1: A child who is 4 cm tall is standing 9 cm from a concave mirror with a focal length of 4 cm. Di Hi M 1//f =1/do + 1/di ¼ - 1/9 = 1/di 9/36 – 4/36 = 1/di 5/36 = 1/di 36/5 = di/1 7.2 = di M = hi/ho -.8 = hi/4 (-.8)(4) = hi -3.2 = hi M = -di/do M = -7.2/9 M = -.8 RAY DIAGRAM
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