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## Homework Statement

monochromatic light of 625 nm of wavelength falls normal to the optical bar. Total number of light lines that appear behind the bar is 11. What is the constant of the difraction bar?

## Homework Equations

3. The Attempt at a Solution [/B]

I tried ##dsinx=ms## where ##s## is the wavelength and ##m## is number of lines. Since x is 90 i can calculate the ##d## to find the distance between the slits but what is diffraction constant?