In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic…

In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?
  1. 0.2 mm
     
  2. 0.1 mm
     
  3. 0.5 mm
     
  4. 0.02 mm
     

Solution

d =1 mm=1×10-3 m
D=1 m.,    λ=500×10-9 m
Width of the central maximum = width of 10 maxima in YDSE
2λDa=10λDd
a=0.2d=0.2 mm

Asked in: NEET 2015 (Phase 1)

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