HELP ME OUT
Level
pending
In newtons ring diameter of 4th &12th dark rings are 0.400 cm & 0.700 cm .Determine the diameter of 20th ring.
0.906 cm
0.632 cm
0.960 cm
0.894 cm
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1 solution
Diameter of n th dark newtons ring is D^2=(4Rn wavelength of incident light)/refractiveindex of medium where R= radius of lens. n=order of dark ring. thus D direcly proportional to square root of order of dark ring. so 0.400 0.400/(d20)^2+4/10=0.894 cm. why this is wrong?????