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Practice exam 3

# Practice exam 3 - Version 001 PracticeExam3 shih(56310 This...

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Version 001 – PracticeExam3 – shih – (56310) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Light Refraction 001 10.0 points X Y When light travels from medium “X” to medium “Y” as shown in the figure: 1. both the speed and the wavelength de- crease correct 2. both the speed and the wavelength in- crease 3. both the speed and the frequency in- crease 4. both the speed and the frequency de- crease 5. both the wavelength and the frequency are unchanged Explanation: According to the figure, the index of re- fraction of “Y” is larger than that of “X”. Therefore, both the speed and wavelength are decreased by a factor of 1 n . The frequency remains constant. Tipler PSE5 31 42 002 10.0 points A glass surface of index 1 . 5 has a layer of water of index 1 . 33 on it. Light in the glass is incident on the glass-water interface. Find the critical angle for total internal reflection. 1. 51 . 3412 2. 90 3. 40 . 9715 4. 76 . 5166 5. 31 . 0213 6. 62 . 4573 correct Explanation: Let : n w = 1 . 33 , and n g = 1 . 5 . Applying Snell’s law to the glass-water inter- face, n w sin θ w = n g sin θ g At the critical angle, θ g = θ c and θ w = 90 , so n g sin θ c = n w θ c = sin 1 parenleftbigg n w n g parenrightbigg = sin 1 parenleftbigg 1 . 33 1 . 5 parenrightbigg = 62 . 4573 . Tipler PSE5 32 03 003 10.0 points Which of the following is true? 1. A concave mirror never forms an enlarged real image of an object. 2. The virtual image formed by a concave mirror is always smaller than the object. 3. A concave mirror always forms a virtual image. 4. A convex mirror never forms a real image of a real object. correct Explanation: The virtual image formed by a concave mir- ror when the object is between the focal point

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Version 001 – PracticeExam3 – shih – (56310) 2 and the vertex of the mirror depends on the distance of the object from the vertex.
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