$w_1=$

${?}^1$ Your response is off by a multiple of ten. mm $(1^{st}$ maxima$)$

$w_2=$ mm $(2^{nd}$ maxima$)$

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$[-/1$ Points$]$

$$ SERCP$1124\mathrm{.}8.$P$\mathrm{.}041.$MI$.$ grating.$)$

first order separation second order separation third order separation $$

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$[-/1$ Points$]$

$$ SERCP$1124\mathrm{.}8.$P$\mathrm{.}046.$

White light is incident on a diffraction grating with $455$ lines$/$mm$.$

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$($a$)$ Calculate the angle ${}_{r2}($in degrees$)$ to the second$-$order maximum for a wavelength of $650$ nm $.$

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$($b$)$ Calculate the wavelength in $nm$ of light with a third$-$order maximum at the same angle ${}_{r2}.$

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