AP EAMCET · PHYSICS · Wave Optics
Two coherent sources \(\mathrm{O}_1\) and \(\mathrm{O}_2\) in Young's double slit experiment are illuminated with monochromatic light of wavelength \(5000 Å\). If a second order dark fringe is formed at a point \(\mathrm{R}\) on the screen, the path difference \(\mathrm{O}_1 \mathrm{R} \sim \mathrm{O}_2 \mathrm{R}\) is
- A \(7.5 \mu \mathrm{m}\)
- B \(0.75 \mu \mathrm{m}\)
- C \(0.075 \mu \mathrm{m}\)
- D \(75 \mu \mathrm{m}\)
Answer & Solution
Correct Answer
(B) \(0.75 \mu \mathrm{m}\)
Step-by-step Solution
Detailed explanation
For second order dark fringe \[ \Delta \mathrm{x}=\frac{3 \lambda}{2} \quad\left[\because \Delta \mathrm{x}=\left(\mathrm{n}-\frac{1}{2}\right) \lambda, \text { for } n \text {th minima }\right] \]…
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