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Green light of wavelength 5100 A from a ...

Green light of wavelength 5100 A from a narrow slit is incident on a double slit. If the overall separation of 10 fringes on a screen 200 cm away is 2 cm find the separation between the slits.

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Width of 10 fringes x `=(D)/(2d) lambda` =2 cm
Here D = distance of the screen =200 cm 2 d = separation between the two slits `lambda` = wavelength of light of light = 5100 A = `5100 xx 10 ^(-8)` cm
`:. 2d = =10(D)/(x)lambda=(10xx200 xx5100 xx10^(-8))/(2)`
`=51 xx10^(-3)=0.051` cm
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