Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. the second-order maximum is seen at 32.5°. what is the wavelength of the incident light?

Respuesta :

Answer:

The wavelength of the incident light is [tex]\lambda =[/tex] 400 nm

Explanation:

Given data

Distance between the sits

[tex]d = \frac{0.075}{50000}[/tex]

d = 1.5 × [tex]10^{-6}[/tex] m

[tex]\theta = 32.5[/tex]°

m = 2

We know that the wavelength of the incident light is given by

[tex]\lambda = \frac{d\sin \theta}{m}[/tex]

Put all the value in above formula we get

[tex]\lambda = \frac{1.5 (\sin 32.5)}{2}[/tex]×[tex]10^{-6}[/tex]

[tex]\lambda =[/tex] 4 × [tex]10^{-7}[/tex] m

[tex]\lambda =[/tex] 400 nm

Therefore the wavelength of the incident light is [tex]\lambda =[/tex] 400 nm