322.exam2.10

322.exam2.10 - Midterm #2 Name ____________ Physics 322...

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Unformatted text preview: Midterm #2 Name ____________ Physics 322 Optics Fall 2010 Short Answer (2 pts each): 1) What is the Fourier transform of a sinc function? 2) Two harmonic fields of frequencies 1 and 2 are added together. What is the frequency of the beat envelope of the resulting field? 3) The object and its image are both 25 cm from a positive thin lens. What is the magnification of the image? 4) From Snell's law derive the critical angle for total polarization (Brewsters angle) from the interface between a material with index n and vacuum. 5) How does M L depend on M T ? Derivations: (10 pts each) 1) An eye with "perfect" eyesight is focussed at infinity (unaccomodated). The distance from the front of the cornea to the retina is approximately 16 mm. a) What is the dioptic power (in mm-1 ) of the unaccomodated eye? b) The eye now focuses at it's near-point at 25 cm (accomodated). What now is the dioptic power of the eye? What is the total change in dioptic power between the unaccomodated and accomodated eye? 2) Two thin lenses are arranged as shown. 2) Two thin lenses are arranged as shown....
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322.exam2.10 - Midterm #2 Name ____________ Physics 322...

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