ch35-p022 - d : d sin = m d = (4)(450 nm)/sin(90) = 1800 nm...

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(b) The slit separation d needs to be decreased. (c) In this case, the 400 nm wavelength in the m = 4 diffraction is to occur at 90°. Thus d new sin θ = m λ d new = (4)(400 nm)/sin(90°) = 1600 nm . This represents a change of | d | = d d new = 200 nm = 0.20 μm. 22. (a) We use Eq. 35-14 to find
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Unformatted text preview: d : d sin = m d = (4)(450 nm)/sin(90) = 1800 nm . For the third order spectrum, the wavelength that corresponds to = 90 is = d sin(90)/3 = 600 nm . Any wavelength greater than this will not be seen. Thus, 600 nm < 700 nm are absent....
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