What is Newton's Ring? How it works & usages?

Newton's rings are ring-shaped interference maximum and minimum seeming around the point of tang ency of a marginally curved convex lens and a plane-parallel plate as light permits through the lens and plate.

The interference pattern in the form of rings happens when light is mirrored from two surfaces, one of which is flat, and the other has a moderately large radius of curvature and comes into contact. If a beam of homo chromatic light is event on such a system in a direction erect to the plane surface, then the light waves reflected from each of these surfaces interfere with each other. The interference pattern shaped in this way comprises of the surfaces of a dark circle witnessed in the place of contact and the neighboring light and dark concentric rings surrounding it.

What is string theory?

The direction of theoretical physics that studies the dynamics of the connections are not point particles and the one-dimensional comprehensive objects, the so-called quantum strings. String theory combines the ideas of quantum mechanics and relativity theory, therefore, based on it, may be to build a future theory of quantum gravity.

String theory is based on the hypothesis that all elementary particles and their fundamental interactions are the result of vibrations and interactions ultramicroscopic quantum strings on the scales of the order of the Planck length 10 -35 m. This approach, on the one hand, to avoid such difficulties, quantum field theory, a renormalization, on the other hand, leads to a deeper view of the structure of matter and space-time.