In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength of the light used is 5896 and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20 . To increase the fringe angular width to 0.21 (with same and D) the separation d between the slits needs to be changed to

1. A. 2.1 mm
2. B. 1.9 mm
3. C. 1.8 mm
4. D. 1.7 mm

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