Question

A beam of light from a laser hits a grid with the grid constant of 1.67 microns. Behind the grid, 5 rays can be observed. The angle between the outermost rays was measured to 94.1 degrees. Calculate the wavelength of the laser light.

Answer 1

n = 5

angle($\theta$) = 94.1^o

d = 1.67 microns = 1.67 × 10⁻⁶ m

dsin($\theta$) = n × $\lambda$

λ = dsin($\theta$) / n = (1.67 × 10⁻⁶ × sin(94.1)) / 5 = 0.33 × 10^-6 m

Answer: λ = 0.33 × 10⁻⁶ m.