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23 Nov 2019
One lens has a focal length of +15.0cm. A second lens offocal length +20.0cm is placed in contact with the first lens. Whatis the equivalent focal length of the combination oflenses?
One lens has a focal length of +15.0cm. A second lens offocal length +20.0cm is placed in contact with the first lens. Whatis the equivalent focal length of the combination oflenses?
Lelia LubowitzLv2
13 Apr 2019