Quiz12_Solutions

Quiz12_Solutions - Physics 222 Fall 2011 Name Section Quiz...

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Physics 222 Fall 2011 Name:_______________ Section:______________ Quiz 12A 1) You illuminate two thin slits in air with a laser and find they produce their first interference minima (m = 0) at ±22° on either side of the central bright spot. You then immerse the setup in a transparent liquid and illuminate the slits again, finding your new minima at ±15°. What is the index of refraction of the fluid? Solution: The light has a different wavelength in the medium given by λ n = λ / n The condition for an interference minima is: For the first minima, m=0. Dividing the equations, 2) At some point in its orbit, the surface of the moon is 370,000 km from the surface of the earth. An astronaut there has just placed a 1.5 meter wide flag. What minimum size objective would you need on your telescope in order to resolve the flag with visible light (400 nm to 750 nm)? Is this a realistic size? Solution: We need to use the Rayleigh criterion to find the minimum diameter of the objective. Pick a short wavelength to give the minimum diameter.
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Quiz12_Solutions - Physics 222 Fall 2011 Name Section Quiz...

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