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Monochromatic light of wavelength 5000 A...

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 ...

A

`0^(@)`

B

`15^(@)`

C

`30^(@)`

D

`50^@)`

Text Solution

Verified by Experts

The correct Answer is:
C
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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