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ENSC 460/894 Assignment 2: (Feb 9 due Feb. 16 2006)
1 For a ND:Yag laser calculate the ratio of the spontaneous radiation coefficient to the stimulated coefficient
(Nd:YAG wavelength is 1064 nm). (5 marks)
2 A biconcave lens of f = 30 mm is mounted 110 mm in front of a plan convex lens of radius 60 mm, n = 1.5 and
is looking at a 3 mm integrated circuit located 30 mm in front of the device.
Using the both the combined lens
formulas and matrix methods give the position and magnification of the resulting image.
Draw a sketch with those
locations.
What is the focal length of the equivalent lens and where is it located? (10 marks)
3 A Huygens eyepiece (occular) is a combination of two positive thin lenses of the same glass.
If the lenses are
separated by half the sum of their focal lengths then chromatic aberration is eliminated.
Assume two thin lenses of
f=2.1 cm (field lens  furthest from the eye) and 1.5 cm (eye lens  closest to the user).
Use both matrix methods and
combined lens formula to solve this question.
(a) What is the combined focal length of the eyepiece (3 marks)
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This note was uploaded on 11/22/2010 for the course ENSC 470 taught by Professor Chapmann during the Spring '10 term at Simon Fraser.
 Spring '10
 Chapmann

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