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Question
Red light of wavelength of 700 nm falls on a double slit separated by 400 nm. (a) At what angle is the first-order maximum in the diffraction pattern? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?
1. undefined
2. The inverse sine of a number greater than 1 is undefined.
3. $\dfrac{\lambda}{d}$ can't be greater than 1. It's necessary to have a combination of wavelength decreasing and spacing between the slits decreasing.
Solution Video