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Unformatted text preview: Paraxial ray conditions: cos ϕ ≈ 1 and sin ϕ ≈ ϕ Spherical surface: R n n S n S n i o 1 2 2 1 − = + F i F o F o F i f S S i o 1 1 1 = + Thin lenses: ( ) ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − − = 2 1 1 1 1 1 R R n f l Point source S Æ point images P , this one to one correspondence Ray Diagrams F o F i F i F o Positive Lens Negative Lens F o F i F o F i F i F o F i F o Important Planes in Thin Lenses The Principal Plane: the plane going through the lens center (optical center) and perpendicular to the optical axis: the optical ray bending occurs at this level. The Focal Planes: the planes going through the two focal points ( F o , F i ) and perpendicular to the optical axis; in the paraxial ray region, bundles of parallel rays will focus to a point on the corresponding focal plane. Example: Image focal plane Important Planes in Thin Lenses The Principal Plane: the plane going through the lens center (optical center) and perpendicular to the optical axis: the optical ray bending occurs at this level. The Focal Planes: the planes going through the two focal points ( F o , F i ) and perpendicular to the optical axis; in the paraxial ray region, bundles of parallel rays will focus to a point on the corresponding focal plane.will focus to a point on the corresponding focal plane....
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This note was uploaded on 10/19/2009 for the course PHY 31 taught by Professor Cebe during the Fall '08 term at Tufts.
 Fall '08
 CEBE

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