In Newton’s rings experiment using light of two wavelengths , it is observed that 10 th order bright ring corresponding to wavelength 1 coincides with 15 th order dark ring corresponding to wavelength λ₂ when viewed by reflected light. Find the ratio of λ1 and λ₂
"r_1=\\sqrt{\\frac{m_1R\\lambda_1}{n}},"
"r_2=\\sqrt{\\frac{m_2R\\lambda_2}{2n}},"
"r_1=r_2,"
"\\frac{\\lambda_1}{\\lambda_2}=\\frac{m_2}{m_1}=1.5."
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