In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away, was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? ( water =4/3 )

1. A. 0.1°
2. B. 0.266°
3. C. 0.15°
4. D. 0.05°

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