JEE Mains · Physics · STD 12 - 10. Wave optics
In a Young's double slit experiment, \(16\) fringes are observed in a certain segment of the screen when light of wavelength \(700 \,nm\) is used. If the wavelength of light is changed to \(400 \,nm\), the number of fringes observed in the same segment of the screen would be........
- A \(28\)
- B \(24\)
- C \(18\)
- D \(30\)
Answer & Solution
Correct Answer
(A) \(28\)
Step-by-step Solution
Detailed explanation
Let the length of segment is " \(\ell^{\prime \prime}\) Let \(N\) is the no. of fringes in " \(\ell^{\prime \prime}\) and \(w\) is fringe width. \(\rightarrow\) We can write \(N w =\ell\) \(N \left(\frac{\lambda D }{ d }\right)=\ell\) \(\frac{N_{1} \lambda_{1} D}{d}=\ell\)…
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