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power 4dThe focal length of a lens with a power of +4D is 25 cm. Show More | Share Save. Class 12 PHYSICS GEOMETRICAL OPTICS. Topper's Solved these Questions. OPTICS BOOK -Presentation on theme: The 4 Discips of Execution (4DX)— Presentation transcript: 1 The 4 Discips of Execution (4DX) Discip 1: Focus on your Wildly Important Goals (Ws) Set only 1 or 2 measurable, achievable goals