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What is the distance between lines on a diffraction grating that produces a second order maximum...

What is the distance between lines on a diffraction grating that produces a second order maximum for 685 nm red light at an angle of 46.6 degrees

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Answer #1

given data

wave length = 685 nm

angle = 46.6 degrees

for the diffraction grating ,the neccessary condition to obtain constructive interferance is,

dsin theta =mlemdla

d=(m*lamdala) / sin theta

= (2*685*10-9 ) /sin46.6

distance between slits (d) = 1.8855*10-6 m

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