A Newton's ring experiment uses a glass lens having radius of curvature 1.0 m. The apparatus is illuminated separately by light having two different wavelengths. Suppose that one of the wavelengths is 550 nm. The 6th bright ring of the 550 nm fringe system coincides with the 5th bright ring of the other. The value of second wavelength is

A Newton's ring experiment uses a glass lens having radius of curvature 1.0 m. The apparatus is illuminated separately by light having two different wavelengths. Suppose that one of the wavelengths is 550 nm. The 6th bright ring of the 550 nm fringe system coincides with the 5th bright ring of the other. The value of second wavelength is