Chapt_36 - University Physics (Prof. David Flory) Chapt_36...

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University Physics (Prof. David Flory) Chapt_36 Monday, August 06, 2007 Name: __________________________ Date: _____________ ___ 1. In an experiment to measure the wavelength of light using a double slit, it is found that the fringes are too close together to easily count them. To spread out the fringe pattern, one could: A) decrease the slit separation D) decrease the width of each slit B) increase the slit separation E) none of these C) increase the width of each slit ___ 2. A lens with a refractive index of 1.5 is coated with a material of refractive index 1.2 in order to minimize reflection. If λ denotes the wavelength of the incident light in air, what is the thinnest possible such coating? A) 0.5 λ B) 0.416 λ C) 0.3 λ D) 0.208 λ E) 0.25 λ ___ 3. A light wave with an electric field amplitude of 2 E 0 and a phase constant of zero is to be combined with one of the following waves: Which of these combinations produces the least intensity? A) wave A has an amplitude of E 0 and a phase constant of zero B) wave B has an amplitude of E 0 and a phase constant of π C) wave C has an amplitude of 2 E 0 and a phase constant of zero D) wave D has an amplitude of 2 E 0 and a phase constant of E) wave E has an amplitude of 3 E 0 and a phase constant of Write the letter for the correct answer on the answer sheet. Write clearly. Page 1
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University Physics (Prof. David Flory) Chapt_36 Monday, August 06, 2007 ___ 4. A liquid of refractive index n = 4/3 replaces the air between a fixed wedge formed from two glass plates as shown. As a result, the spacing between adjacent dark bands in the interference pattern: A) increases by a factor of 4/3 D) decreases to 3/4 of its original value B) increases by a factor of 3 E) decreases to 1/3 of its original value C) remains the same ___ 5. Monochromatic light, at normal incidence, strikes a thin film in air. If λ denotes the wavelength in the film, what is the thinnest film in which the reflected light will be a
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Chapt_36 - University Physics (Prof. David Flory) Chapt_36...

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