Question

In Young's experiment, the
distance between the two images
of the sources is 0.6 mm and the
distance between the source and
the screen is 1.5 m. Given that the
overall separation between 20
fringes on the screen is 3 cm,
calculate the wavelength of light
used.​

Answer 1

Explanation:

Distance between the slits d=1mm=10

−3

m

Change in position of screen ΔD=0.25m

Change in fringe width Δβ=(0.75−0.6)mm

∴ Δβ=0.15mm=0.15×10

−3

m

Change in fringe width Δβ=

d

λ

ΔD

0.15×10

−3

=

10

−3

λ

×0.25

⟹ λ=600nm