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an object is placed 20 cm from a converging lens. An image 3x the size of...

an object is placed 20 cm from a converging lens. An image 3x the size of the object is formed on the screen. What is the focal length of the lens?

a) -15 cm

b) -30 cm

c) +30 cm

d) +15 cm

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Answer #1

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Thanks for asking..u = 20cm/ ni- 3 ナレ ヲーナー ク3u 4 зи 3720

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