Answer to Question #348660 in Optics for loini bhila

Question

Light is incident on a diffraction grating that has 300 lines /mm. A diffraction pattern is observed. The angle between the central maximum and second order maximum was measured to be 250 . Calculate the wavelength of the light.

Answer 1

$d\sin\varphi=k\lambda,$

$\lambda=\frac{d\sin\varphi}k=704.4~nm.$