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# Lec-25 - Previous Lecture Refraction(Snell's Law Ray...

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Previous Lecture Refraction (Snell’s Law) Ray tracing for lenses Lens Equation: 1 d o + 1 d i = 1 f – p.

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Today Rainbows Lensmaker’s Equation Two lens systems (e.g., telescope) Aberrations – p.
Rainbows refraction total internal reflection dispersion – p.

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Lensmaker’s Equation 1 f = ( n - 1) 1 R 1 - 1 R 2 – p.
Lensmaker’s Equation 1 f = ( n - 1) 1 R 1 - 1 R 2 Careful with the signs of the radii of curvature R 1 and R 2 ! – p.

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Lensmaker’s Equation 1 f = ( n - 1) 1 R 1 - 1 R 2 Careful with the signs of the radii of curvature R 1 and R 2 ! R is positive if the center of curvature C is on the same side as the outgoing light; otherwise R is negative. – p.
Types of Lenses Converging Lenses Diverging Lenses Meniscus Planoconvex Double convex Meniscus Planoconcave Double concave – p.

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Two lens systems (I) The image made by the first lens is the object for the second lens. – p.
Two lens system (II) – p.

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Telescope Objective Eyepiece f o f e f e Fig.34-31 – p.
Nomenclature lens diameter = focal length f -number f -number = focal length lens diameter – p.

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Spherical Aberration – p. 1
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Lec-25 - Previous Lecture Refraction(Snell's Law Ray...

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