In young's double slit experiment, light of wavelength 6000 angstrom is used to get an interference pattern on a screen. The fringe width changes by 1.5 mm when the screen is brought towards the double slit by 50 cm. find the distance between the two slits.

Dear Student ,
Here the given data is :
fringe width,β=1·5 mmD=50 cmd=?λ=6000 A0Therefore ,distance between two slits is ,d=λDβ=6000×10-8×500·15=0·02 cm
Regards

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