COMEDK · Physics · 26. Wave Optics
The width of the fringes obtained with a light of wave length \(6.2 \times 10^{-8}\) m is 1.82 mm. If the whole apparatus is immersed in a liquid of refractive index 1.3, what will be the width of the resulting fringe?
- A \(1.4\) mm
- B \(1.82\) mm
- C \(2.8\) mm
- D \(0.71\) mm
Answer & Solution
Correct Answer
(A) \(1.4\) mm
Step-by-step Solution
Detailed explanation
The fringe width in air is given by \(\beta = \dfrac{\lambda D}{d}\). When the apparatus is immersed in a liquid of refractive index \(\mu\), the wavelength of light in the liquid becomes \(\lambda' = \dfrac{\lambda}{\mu}\). The new fringe width is…
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