When two thin lenses with focal lengths a and b are in contact, the focal length, F, of the combination can be obtained from the . The focal length of a combination of two Fal identical lenses is 50 mm. If one lens is replaced by another having a focal length x mm less than the one it replaces, by how much does the focal length of the combination change?
When two thin lenses with focal lengths a and b are in contact, the focal length, F, of the combination can be obtained from the . The focal length of a combination of two Fal identical lenses is 50 mm. If one lens is replaced by another having a focal length x mm less than the one it replaces, by how much does the focal length of the combination change?
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Transcribed Image Text:13. When two thin lenses with focal lengths a and b are in contact, the
focal length, F, of the combination can be obtained from the
formula:!-1.! The focal length of a combination of two
Fab
identical lenses is 50 mm. If one lens is replaced by another having
a focal length x mm less than the one it replaces, by how much does
the focal length of the combination change?
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