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Visible light of wavelength 6000 x...

Visible light of wavelength 6000 ` xx 10 ^( - 8 ) ` cm falls normally on a single slit and produces a diffraction pattern. It is found that the second diffraction minimum is at ` 60 ^(@) ` from the central maximum. If the first minimum is produced at ` theta _ 1`, then ` theta _ 1 ` is close to :

A

` 45 ^(@)`

B

`20 ^(@) `

C

` 25 ^(@) `

D

` 30 ^(@) `

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