the angular width of central max is 30 when illuminated by a light of wavelength 6000 A the distance between the slits will be
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β=
d
λD
i.e.,β∝λ
So,
λ
6000
=
70
100
λ=4200
A
˚
And μ=
λ
medium
λ
vaccum
μ=
4200
6000
=1.43
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