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An object 5 cm long is held 25 cm from a converging (convex) lens of focal length 10 cm. Using the lens formula, the image distance v is

Question
An object 5 cm long is held 25 cm from a converging (convex) lens of focal length 10 cm. Using the lens formula, the image distance v is
v = 10 cm
v = 50/3 cm (approximately 16.7 cm)
v = 25 cm
v = -25 cm
Answer
v = 50/3 cm (approximately 16.7 cm)
Detailed Explanation
1/v = 1/f + 1/u = 1/10 + 1/(-25) = 1/10 - 1/25 = (5-2)/50 = 3/50, so v = 50/3 » 16.7 cm.
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