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Unformatted text preview: = 60. We can then determine the focal length via 1 72 + 160 = 1 f 1 (6). Correct answer is C This can be found from the formula Δ y = Lλ d where Δ y is the distance between bright lines. 2 (7). Correct answer is B We just have δλ λ = 1 Nm which gives N = 1 / 3(475 /. 48) ’ 330 (8). Correct answer is A This is a case where there is an extra phase shift and hence the ﬁrst constructive interference will happen at a thickness of 1/4 of the wavelength in the soap; d =.25(660/1.33) giving result A (9). Correct answer is B For objects at inﬁnity, the image distance is 50mm; for an object at p=800 mm, the image distance is easily found to be 53.333; hence the distance must vary by 3.33 mm (10). Correct answer is B The angular resolution is 1.44 λ / .85. This must be roughly equal to .03/ L where L is the distance to the object. This leads to answer B...
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 Spring '11
 groisman
 Correct Answer, 60cm, 50mm, 3.33 mm

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