A convex lens has a focal length of 20 cm. An object is placed 30 cm from the lens. The image distance is:

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• A 60
• B 15
• C 50
• D 10

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Answer: A. 60

Focal length, f = 20 Object distance, u= -30. 1/20-1/30= 1/60 Hence, v = +60

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