Figure (a) below shows a lens with radius of curvature R =5.1 m and the diameter

Question

Figure (a) below shows a lens with radius of curvature R =5.1 m and the diameter D = 22 mm lying on a flat glassplate and illuminated from above by light with wavelength = 501 nm. Figure (b) below (a photograph taken fromabove the lens) shows that circular interference fringes (calledNewton's rings) appear, associated with the variablethickness d of the air film between the lens and theplate. In this Newton's rings experiment (a) howmany bright rings are produced? (b) How manybright rings would be produced if the arrangement were immersed inwater (n = 1.33)?

Explanation / Answer

We have:
         R =5.1m           r =11mm          = 501nm   r = (m+1/2)R => m = r2/R - 1/2 plug values, we will have a result. b) if all system is imersed in water (n = 1.33) then:            n= (m+1/2)/r2 * R => m= nr2/R -1/2 plug values, we will have a result.

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