(Solved): find both please! Light of wavelength 422nm (in vacuum) is incident on a diffraction grating that ...

Light of wavelength $422\mathrm{nm}$ (in vacuum) is incident on a diffraction grating that has a slit separation of $1.2\times 10^{?5}\mathrm{m}$. The distance between the grating and the viewing screen is $0.11\mathrm{m}$. A diffraction pattern is produced on the screen that consists of a central bright fringe and higher-order bright fringes (see the drawing). (a) Determine the distance y from the central bright fringe to the secondorder bright fringe. (Hint: The diffraction angles are small enough that the opproximation $\tan (?)?\sin (?)$ can be used)(b) If the entire apparatus is submerged in water $(n_{\text{water }}=1.33$ ), what is the distance $y$ ?