An object is placed in front of a convex lens of focal length . At what distance from the lens (in cm) is the image formed?
Answer and explanation
Correct answer: A. 30
- Step 1: Identify the optical parameters using Cartesian sign conventions: focal length (for a converging convex lens) and object distance .
- Step 2: Apply the thin lens formula: .
- Step 3: Simplify the fractional expression: , which gives image distance .
Answer
30.
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