MHT CET · Physics · Wave Optics
The path difference between two interfering light waves meeting at a point on the screen is \(\left(\frac{57}{2}\right) \lambda\). The band obtained at that point is
- A \(29^{\text {th }}\) bright band
- B \(57^{\text {th }}\) dark band
- C \(57^{\text {th }}\) bright band
- D \(29^{\text {th }}\) dark band
Answer & Solution
Correct Answer
(D) \(29^{\text {th }}\) dark band
Step-by-step Solution
Detailed explanation
Path difference \(=\frac{57}{2} \lambda=28.5 \lambda\)
Since the path difference is not an integral multiple of \(\lambda\), it is not a bright bond.
Path difference for \(n\)th dark band is given by \(\left(n-\frac{1}{2}\right) \lambda\)
Hence \(\mathrm{n}=29\).
Since the path difference is not an integral multiple of \(\lambda\), it is not a bright bond.
Path difference for \(n\)th dark band is given by \(\left(n-\frac{1}{2}\right) \lambda\)
Hence \(\mathrm{n}=29\).
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