Question

8) A diffraction grating has a spacing of 1.6 x 10 m. A beam of light incident normally on the
grating. The first order maximum makes an angle of 200 with the undeviated beam. What is
the wavelength of the incident light?​

Answer 1

Answer:

d sin⁡θ=nλ

1.6 ∙ 〖10〗^(-6) sin⁡20=(1)(λ)

λ=550 nm.