COMEDK · Physics · 25. Ray Optics
Newton's rings are observed normally in reflected light of wavelength \(5000 Å\). The diameter of the 10 th dark ring is \(0.005 \mathrm{~m}\). The radius of curvature of the lens is
- A \(1 \mathrm{~m}\)
- B \(1.25 \mathrm{~m}\)
- C \(2 \mathrm{~m}\)
- D \(0.5 \mathrm{~m}\)
Answer & Solution
Correct Answer
(B) \(1.25 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
In Newton's ring experiment, diameter of \(n\)th dark ring, \(D_{n}=2 \sqrt{n \lambda R}\) \(\Rightarrow\) \(R=\frac{D_{n}^{2}}{4 n \lambda}\) ...(i) Given, \(n=10, D_{10}=0.005 \mathrm{~m}\) \(\lambda=5000 Å=5 \times 10^{-7} \mathrm{~m}\) \(\therefore\) Putting these values in…
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