Question

4
.
between the slits is 2 mm, the wavelength 2 of the
light used is 5896 Å and distance D between the
In Young's double slit experiment the separation
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 i and D)
the separation between the slits needs to be
changed to
(1) 1.8 mm
(2) 1.9 mm
(3) 1.7 mm
(4) 2.1mm​

Answer 1

Answer:

1.9mm

Explanation:

(aw1)(d1)=(aw2)(d2)..........................aw=angular width

so

(0.20)(2)=(0.21)(d)

=1.9mm