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Unformatted text preview: 44. The angular location of the mth order diffraction maximum is given by mλ = d sin θ.
To be able to observe the fifth-order maximum, we must let sin θ|m=5 = 5λ/d < 1, or
λ< d 100 nm / 315
= 635 nm.
5 Therefore, the longest wavelength that can be used is λ = 635 nm. ...
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