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Grade: 12th Pass

                        

A wire grating is made of 200 wires per cm placed parallel to each other with uniform separation . The diameter of each wire is 0.025mm calculate the angle of diffraction for third order spectrum and also find the absent spectra if any, wavelenght of light used is 6000A O .

one year ago

Answers : (1)

suresh kumar
37 Points
							
each wire diameter is 0.025mm,
there are 200 wires in 1cm
so, the total width of 200 wires = 200*0.025mm = 5mm per 1cm (since there are 200 wires in 1cm)
remaining space is the separation.
hence the separation between two wires = 5mm/200 = 0.025 mm
we know dsinθ = mλ
   here m=3 , d = 0.025mm and θ = θ3 we need to find θ3
     0.025mm sinθ3 = 3*6000A
                on sloving we get θ3 = sin-1 (0.072)
                                      
 
5 months ago
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