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NEET 2018, Physics Q18: Young’s Double Slit Experiment

NEET2018Paper 2018Physics
Q.

In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength   of the light used is 5896 Å 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 between the slits needs to be changed to

  1. A

    1.8 mm

  2. B

    2.1 mm

  3. C

    1.9 mm

  4. D

    1.7 mm

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