Solution:

The radii of Newton's light ring with a constant radius of curvature of the lens is given by

$$ r_{k}=\sqrt{\frac{(k-0.5) \lambda R}{n}} $$

where,

$r=$ radius of the ring

$k=$ newton's constant

$\lambda=$ wavelength of a ray

$\mathrm{R}=$ radius of curvature

$\mathrm{n}=$ refractive index

Now, the radius of the …