Question

In Young's double slits experiment, the position of $5^{\text {th }}$ bright fringe from the central maximum is $5 \,cm$ The distance between slits and screen is $1 \,m$ and wavelength of used monochromatic light is $600 \,mm$ The separation between the slits is:

• A. $12\, \mu m$
• B. $60\, \mu m$
• C. $36\, \mu m$
• D. $48 \,\mu m$

Answer 1

Answer: (D)

$48 \,\mu m$

Answer 2

Given
D=1m
λ=600×10−9m
n=5
As ynth​=dnλD​
⇒d5×600×10−9×1​=5×10−2
⇒d=5×10−25×600×10−9×1​=60×10−6m
⇒d=60μm