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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? (μwater = 4/3) 

(1) 0.266° 

(2) 0.15° 

(3) 0.05° 

(4) 0.1°

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Ans : (2) 0.15°

Explanation:

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