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What is the focal length of a concave lens that forms an image with a xi value of -10.0 cm when an object is 35.0 cm from the lens? ​
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2 votes
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What is the focal length of a concave lens that forms an image with a xi value of -10.0 cm when an object is 35.0 cm from the lens?

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User Joel Almeida
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1 Answer

5 votes
5 votes

Answer:

1 / f = 1 / object + 1 / image = 1 / 35 - 1 / 10 thin lens equation

f = o * i / (o + i)

f = -10 * 35 / (-10 + 35) = -350 / 25 = -14 cm

User Kantholy
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