1.

Monochromatic light of wavelength 5000 A is incident on narrow slit of width 0.001 mm. Now this light is focused on screen placed on focal plane of convex lens. For this interference first minima will be obtained at ...

Answer»

`0^(@)`
`15^(@)`
`30^(@)`
`50^@)`

Solution :For first minima `d sin theta= N lambda=1lambda`
`sin theta=(lambda)/(d)`
`=(5000xx10^(-10))/(0.001xx10^(-3))=0.5`
`:. Theta=30^(@)`


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