# OIA_07_lenses_00.pdf - Lenses Optics Imaging A Glass Types...

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Lenses Optics & Imaging A Glass Types of glass n d = index of refraction at the “d” wavelength d line: λ = 587.56 nm (He) (most common) V d = Abbe number = (n d - 1) / (n F - n C ) F line: λ = 486.13 nm (H) C line: λ = 656.27 nm (H) V e = (n e - 1) / (n F’ - n C’ ) (Easier to generate lines, from Cd and Hg) Alternative Abbe number **Remember to check the formula used for the Abbe number when comparing glasses Types of glass n d = index of refraction at the “d” wavelength d line: λ = 587.56 nm (He) (most common) V d = Abbe number = (n d - 1) / (n F - n C ) F line: λ = 486.13 nm (H) C line: λ = 656.27 nm (H) Example crown glass Schott BK7G18 n d = 1.5197 n F = 1.5254 n C = 1.5172 V d = 0.5197 / 0.0082 = 63.4 Example flint glass Schott SF11 n d = 1.7847 n F = 1.8065 n C = 1.7760 V d = 0.7847 / 0.0305 = 25.7 Types of glass Types of glass Map of Japan Dispersion LOW Abbe # implies HIGH dispersion (because the denominator dominates the calculation) Flint glasses Crown glasses Sellmeier equation Coe cients are determined empirically. Coefficient Value B 1 1.03961212 B 2 0.231792344 B 3 1.01046945 C 1 6.00069867 × 10 3 μ m 2 C 2 2.00179144 × 10 2 μ m 2 C 3 1.03560653 × 10 2 μ m 2 e.g., for BK7: Absorption Note: Y-scale starts at 0.9 Autofluorescence Due to defects in the glass (“color centers”), impurities, etc.  #### You've reached the end of your free preview.

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