First slide

Coherent sources and their importance in interference

Question

In Young's double slit experiment using sodium light ( $λ$ = 5898 Å), 92 fringes are seen. If given colour ( $λ$ = 5461 Å) is used, how many fringes will be seen

Easy

A

62
B

67
C

85
D

99

Solution

$(n_{1} λ_{1} = n_{2} λ_{2}) \frac{n_{1}}{n_{2}} = \frac{λ_{2}}{λ_{1}} \Rightarrow \frac{n_{1}}{92} = \frac{5898}{5461} \Rightarrow n_{1} = 99$

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