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In young's double slit experiment. The s...

In young's double slit experiment. The separation d between the slits is 2 mm, the wavelength `lambda` of the light used is 5896Å 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 `lambda` and D ) the separation between the slits needs to be changed to

A

2.1 mm

B

1.9 mm

C

1.8 mm

D

1.7 mm

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