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Questions 61 and 62 are based on following paragraph : A Young's double slit arrangement produces interference fringes for sodium light with wavelength 5890 Å that are 0.20 mm apart. 61. Their fringe angular separation in air is

Answer»

`0.10^(@)`
`0.18^(@)`
`0.09^(@)`
`0.06^(@)`

Solution :In AIR `theta = (lambda)/(d) = (5890 XX 10^(-10))/(0.2 xx 10^(-3)) = 0.003 rad = 0.18^(@)`.


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