92 fringes are obtained in the definite distance R on screen by Young's double slit experiment using sodium light of (lambda = 5898Å). If (lambda=5461Å) is used, how many fringes will be obtained in the same distance ?

92 fringes are obtained in the definite distance R on screen by Young'

1.	92 fringes are obtained in the definite distance R on screen by Young's double slit experiment using sodium light of (lambda = 5898Å). If (lambda=5461Å) is used, how many fringes will be obtained in the same distance ?
Answer» 62 67 85 99 Solution :Here `lambda_(1)=5898Å, lambda=5481Å, n_(1)=92` Now `R=n_(1)barx_(1)=n_(2)barx_(2)` `:. (barx_(2))/(x_(2))=(n_(2))/(n_(1))`and by Young.s experiment `barx_(1) prop lambda_(1) and barx_(2) prop lambda_(2)` `:. (barx_(1))/(barx_(2))=(lambda_(1))/(lambda_(2))` `:. n_(2)=n_(1)xx(lambda_(1))/(lambda_(2))=92xx(5898)/(5481)` `:. n_(2)=99`

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92 fringes are obtained in the definite distance R on screen by Young's double slit experiment using sodium light of (lambda = 5898Å). If (lambda=5461Å) is used, how many fringes will be obtained in the same distance ?

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