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Two convex lenses, each with a power of 2 D, are placed in close contact. What is the focal length of the combined lens system?

1. Two convex lenses, each with a power of 2 D, are placed in close contact. What is the focal length of the combined lens system?

 

Combined power simply adds: 2 D + 2 D = 4 D. Focal length equals 1 divided by that combined power: 1 ÷ 4 = 0.25 m.

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