Exam 3--PHYS 202--S10
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1 ame: Exam 3--PHYS 202--S0 Multiple Choice Identify the choice that best completes the statement or answers the question A person uses a convex lens that has a focal length of 25 cm to inspect a gem The lens forms a upright image Is the image real or virtual? a real c neither, no image is formed b virtual d not enough information 2 You focus on an object that is very far away Then, the object moves closer to you The focal length of your eye lens has a decreased c stayed the same b increased 3 What happens to the image size in a flat mirror when you move away from the mirror? a it gets bigger c it remains the same size b it gets smaller d it depends on the size of the mirror 4 If you want to set fire to a pile of leaves with a lens, which of these is the best one to use? a convex lens c neither of these b concave lens d both of these will work
2 5 The following figure shows the positions of a mirror, the object, and the image What type of mirror would produce the image as shown? a convex mirror c flat mirror b concave mirror d Either concave or convex 6 Lenses experience which of these aberrations: I Spherical Aberration II Chromatic Aberration a I c I & II b II d neither of these 7 A diffraction grating has 3000 lines per centimeter What is the slit spacing, d, for this grating? a 3x0-3 m c 3000 m b 2x0-4 m d 33x0-6 m 2
3 8 The following figure shows a Michelson interferometer If the source of light is a laser of wavelength λ, what is the smallest distance the translating mirror must move ( x) in order to see a shift on the detector of fringe (ie where there was once a dark fringe, there would now be a bright fringe)? a λ c 2 λ b 4 λ d 2 λ 9 The following figure shows the interference pattern produced by a diffraction grating What is the pathlength difference of the two waves that are incident to create the dark fringe indicated by the arrow? a b λ 4 c λ 2 λ d 2 λ 3
4 0 In a single slit diffraction pattern, what would you do to make the central bright spot narrower? a move the screen further away c decrease the slit width b increase the wavelength d increase the slit width These 2 waves are: a in phase c 360 out of phase b 90 out of phase d 80 out of phase 2 What caused the diffraction pattern in this picture? a light incident on a circular object (such c light from a light bulb incident on a as a penny) double slit b a laserbeam incident on a single slit d none of these 4
5 3 Place these stages in the proper order for the formation of a star: Star 2 Protostar+disk 3 Star-forming cloud 4 Star-forming core a 3, 2, 4, c 3, 4, 2, b 4, 3, 2, d 2, 3, 4, 4 Why is star-formation activity more readily apparent in infrared observations than in visible images? a infrared light can pass through dust unattenuated b visible light is obscured by the dust in star-forming regions c star-forming regions emit radiation mostly in the infrared part of the spectrum d all of these 5 This plot has reddening and distance for a group of stars Which of these statements best describes the location of the stars in the box on the plot? a in another galaxy c behind a star-forming core b beside a star-forming core d in front of a star-forming core 5
6 Problem 6 (5 pts) Two lenses are configured as in this figure; their focal lengths are as shown If the object is a distance p=20 cm to the left of lens, what is the final position and magnification of the image from lens 2? Image position: Total magnification_ 6
7 7 (5 pts) An object, 3 cm high, is 20 cm in front of a mirror The image is upright and 5 cm high What type of mirror is this? What is the magnification? Where is the image located? What is the focal length of the mirror? 7
8 8 (5 pts) Red light at 650 nm is diffracted by a grating with 5000 lines per cm On a screen 5 meters away, what is the distance between the central fringe and the 2nd bright fringe? Sketch the diffraction pattern that is visible on the screen Show (& calculate) the appropriate number of orders 8
9 9 (0 pts) A Michelson interferometer uses light of wavelength 500 nm As you move the translating mirror in this figure, 300 bright fringes pass a fixed point on the detector How far did the mirror move? 9
10 20 (5 pts) A double slit apparatus has a slit separation of 02 mm Light of wavelength 630 nm is incident on the slit The diffraction pattern is on a screen 2 m away What is the width of the central bright fringe? 0
11 ID: A Exam 3--PHYS 202--S0 Answer Section MULTIPLE CHOICE ANS: B PTS: 2 ANS: A PTS: 3 ANS: C PTS: 4 ANS: A PTS: 5 ANS: B PTS: 6 ANS: C PTS: 7 ANS: D PTS: 8 ANS: B PTS: 9 ANS: B PTS: 0 ANS: D PTS: ANS: B PTS: 2 ANS: A PTS: 3 ANS: C PTS: 4 ANS: D PTS: 5 ANS: C PTS: PROBLEM 6 ANS: PTS: 7 ANS: PTS: 8 ANS: PTS: 9 ANS: PTS: 20 ANS: PTS:
A) n L < 1.0 B) n L > 1.1 C) n L > 1.3 D) n L < 1.1 E) n L < 1.3
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