The lens has a radius of curvature R and is lying on a flat glass block and illu

Question

The lens has a radius of curvature R and is lying on a flat glass block and illuminated from above, Circular interference fringes (called Newton's rings) appear, associated with the variable thickness d of the air film between the lens and the plate. In a particular Newton's rings experiment the radius of curvature of the lens is 5.25 meters and its diameter is 16.41 mm. How many bright rings are produced? Assume incident light with a wavelength of 753.0 nm. How many bright rings would be seen if the arrangement were immersed in a liquid with a refractive index of 1.95 if the lens and glass block have a refractive index of 2.15?

Explanation / Answer

I know its not the complete solution, but you can refer to:

http://www.physicsforums.com/showthread.php?t=471141

to get an idea of how to approach this problem.

Hope this helps at least a little bit.
Cheers, mate!

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