Class4

# Class4 - Read Hecht from Chapter 5 5.1 to 5.5 HW1 due today...

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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

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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.

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