# Lec-28 - Previous Lecture one slit two slits diffraction...

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Previous Lecture one slit, two slits diffraction pattern from one slit diffraction pattern from circular aperture – p.

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Today Resolution of optical instruments Polarization Information about the final – p.
Diffraction by a circular aperture Image of a point source (wavelength λ ) – p.

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Resolution of Optical Instruments – p.
Image of a Single Star Image of a point source (wavelength λ ) – p.

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Two Closely Spaced Stars – p.
A Just-resolved Binary Star Center of image for first star. Center of image for second star. – p.

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Problem If two binary stars are separated by 1.5 arcseconds, what is the minimum diameter (D) objective lens a telescope must have in order to resolve them? – p.
Problem If two binary stars are separated by 1.5 arcseconds, what is the minimum diameter (D) objective lens a telescope must have in order to resolve them? Solution: Use the Rayleigh criterion: θ = 1 . 22 λ D D = 1 . 22 λ θ – p.

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Resolving Binary Stars Image of 1.5 arcsecond binary star 60 mm 102 mm 200 mm Diameter of objective lens – p.
Polarization This wave is polarized in the y direction. (Fig. 32-14) – p. 1

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Polarization Effects I 0 I 0 /2 I 0 /4 I 0 /8 I 0 /2 I 0 Figures 36-35, 36-37 – p. 1
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