An object is placed 10 cm in front of a concave mirror with a20-cm focal length.

Question

An object is placed 10 cm in front of a concave mirror with a20-cm focal length. Determine the image location (in cm) a) -20 b) -15 c) -10 d) -5 An object 50-cm high is placed 1m in front of a converginglens whose focal length is 1.5m. Determine the image location(in m) a) 3 b) -3 c) 0.6 d) -0.6 An object is placed 10 cm in front of a concave mirror with a20-cm focal length. Determine the image location (in cm) a) -20 b) -15 c) -10 d) -5 An object 50-cm high is placed 1m in front of a converginglens whose focal length is 1.5m. Determine the image location(in m) a) 3 b) -3 c) 0.6 d) -0.6

Explanation / Answer

do=distance to object di=distance to image f=focus do=[(1/f)-(1/di)]-1 question 1: do=[(1/20)-(1/10)]-1=-20cm question 2: do=[(1/1.5)-(1/1)]-1=-3m

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