ME/CS 132a, Winter 2010, Homework 1 FAQ
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Revision as of 22:09, 13 January 2011 by Hanshuo (Created page with '__NOTOC__ == Problem 1 == * It looks like the units don't exactly cancel out in the exponential term in the Planck's law. Is this supposed to happen? ** '''Answer:''' The correct…')
- It looks like the units don't exactly cancel out in the exponential term in the Planck's law. Is this supposed to happen?
- Answer: The correct unit for the Planck constant is J·s (but everything else is correct). [Shuo]
- Do we have to show that the focal length is equal to R/2/(n-1)?
- Answer: No, you don't. [Shuo]
- Can we use the fact that the index of refraction of a vacuum (and approximately the index of refraction of air) is 1?
- Answer: You can assume that the refractive index of the air is 1 when deriving the thin lens equation, but the first part (showing the ray is not refracted if it passes the center of a thin lens) shouldn't depend on this. [Shuo]