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Ashok0210
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Asked: 2021-03-21T03:45:38+00:00 In:

In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1º. What is the spacing between the two slits?

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Class 12 Physics
CBSE and UP Board
Wave Optics
Chapter-10 Exercise 10.16
NCERT Solutions for Class 12 Physics Chapter 10 Question-16
Additional Exercise

2020-2021cbse and up boardclass 12 chapter-10 physicsclass 12 physicsncert class 12 wave optics
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      Wavelength of light used, λ = 6000 nm = 600 x 10-9 m

      Angular width of fringe, 0 = 0.1° = 0.1 x π/180 = 3.14 /1800 rad

      Angular width of a fringe is related to slit spacing (d) as: 0 = λ /d  => d = λ/0

      => d = (600 x 10-9) /(3.14/1800)  = 3.44 x 10⁻4 m

      Therefore, the spacing between the slits is 3.44 x 10⁻4 m.

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