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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 -The power to move, walk and travel in four dimensions. Sub-power of Unrestricted Movement and 4th-Dimensional Access. Technique of Space-Time Manipulation and Dimension Manipulation.