diffraction grating

1. For diffraction grating, dsin@ = n入

For first order maximum, n = 1

So, dsin20.5* = 632.8 X 10^-9

Grating separation, d = 1.81 X 10^-6 m



2. By E = hc/入

Energy = (6.63 X 10^-34)(3.0 x 10^8)/(410 X 10^-9)

= 4.85 X 10^-19 J

= 3.03 eV