An object is 30 cm from a thin convex lens of focal length 10 cm. Where is the image?
Answer and explanation
Correct answer: B. 15 cm from the lens (real image)
- Step 1: Use with cm. Step 2. , so cm, positive, which means a real image. Answer: 15 cm from the lens (real image). Why not the others: a virtual image would need the object inside the focal length. 7.5 cm and 20 cm do not fit.
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