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Question

In the Young's experiment, using light of λ=5893A0,62 fringes are observed in the fields of view.how many fringers will be formed in the field of view for wavelength of λ=5461A0:-

A
62
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B
66
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C
60
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D
58
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Solution

The correct option is D 58
Given,
β1=62
λ1=5893A0
β=?
λ2=5461A0
Fringe width in young's experiment,
β=λDd
βλ
β2β1=λ2λ1
β2=β1λ2λ1
β2=62×5461A05893A0
β2=58


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