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The first diffraction minima due to a si...

The first diffraction minima due to a single slit diffraction is at `q = 30^(@)` for a light of wavelength 5000 Å. The width of the slit is-

A

`5 xx 10^(-5)` cm

B

`1.0 xx 10^(-4)` cm

C

`2.5 xx 10^(-5)` cm

D

`1.25 xx 10^(-5)` cm

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