For this question your laser has a wavelength of 628.3[nm]. You measure a distance from diffraction...

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Answer 1

Answer #1

In interfreence or diffraction pattern

the needed equation is Y = mLR/d---------------1

and d sin theta = mL--------------------2

where L = wavelgnth

m = order = 1,2,3,4, ......... for brigth bands

m = 1.5, 2.5, 3.5, 4.5, ......for dark bands

R is the distance from slit to screen

Y = disatnce from central spot to nth order fringe or fringe width

--------------------------------------------------------------

so here now we apply d = mLR/Y

d = 1* 628.3nm * 0.25/0.1022

d = 0.001536 mm

so slit per mm= 650.7 or 651 lines per mm

Answer 2

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