Physics126.Exam3.2001 - I Exam 3 Solutions Pagel*u7b 1. An...

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I Exam 3 Solutions 1. An object is placed 200 cm from a screen. When a converging lens is placed between the object and screen at a distance of 160 cm from the object, an image is formed on the screen. Without moving the object or screen, an image can also be formed on the screen when the distance from the object to the lens is 8cm 16 cm 20 cm 32 cm 40 cm If the object is 160 cm from the lens, the image must be 200 cm - 160 cm = 40 cm from the lens. The image distance can be interchanged with the object distance. Pagel*u7b A) B) c) D) +E) 2. This figure shows an image produced by a lens. ObjEct Which statement is correct? +B) E) Both the Object and Image arc at the focal points. Each of the 5 rays of light take the same time to travel from the object to the image. The image is virtual. The magnification is +1.0. This is a diverging lens. Light travels in the path that takes the least amount of time. Since light can take any of the paths shown, they must all be the least time, and take the same amount of time. 3. A narrow slit is illuminated with sodium light of wavelength 589 nm. If the central maximum extends to !30o, how wide is the slit? A) 0.5 mm B) 2200 nm C) 33,000 nm * D) 1180 E) 5890nm d sinS Fn]. , 589rerlr sin 30' 4. A helium-neon laser ()u = 632.8 nm) is used to calibrate a diffraction grating. If the first order htto: I lhep I phvsics I 26 w02lexams/EXAM3.htm rUzu2002
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Exam 3 Solutions maximum occurs at20.5", what is the line spacing? * A) l.St x to-6 m B) 1.0 x 10-5 m C) 1.0 x 10-a m D) 1.31 x 10-6 m E) 676 x 10-7 m Page 2 of 6 d sin0 = mJ. . 632.8nm d=- sin 20.5' 5. The reason two slits are used, instead of one slit, in a double slit interference experiment is + A) to provide a path length difference. B) one slit is for E, the other slit is for B. C) one slit is frequency, the other is for wavelength. D) for horizontal and vertical polarization. E) to increase the intensity. Interference is the combination of two coherent rays of light. The two slits provide the two coherent
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This test prep was uploaded on 04/06/2008 for the course PHYSICS 126 taught by Professor Amidei during the Winter '08 term at University of Michigan.

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Physics126.Exam3.2001 - I Exam 3 Solutions Pagel*u7b 1. An...

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