Question

In young double slit experiment 12 fringes are observed in certain region of the screen when light of wavelength 600nm used if wavelength changed to 400nm find number of fringes in same

Answer 1

Answer:18

n1*L1=n2*L2

(Where n1 , n2 are no. Of fringes

And L1 and L2 are respective wavelengths)

Therefore

12*600=n2*400

n2=18