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What is the angular spread of the first ...

What is the angular spread of the first maximum and the central maximum when diffraction is observed with 540 nm light through a slit of width 1 mm ?

A

`270 xx 10^-6 rad`

B

`540 xx 10^-6 rad`

C

`810 xx 10^-6 rad`

D

`1080 xx 10^-6 rad`.

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