Chapter 24, Problem 24Q

To determine

To explain: The reason for the Newton’s rings to be closer together but farther from the center.

Explanation of Solution

Introduction:

When a Plano-convex lens is in contact with a plane glass plate, then the light reflected from it results in formation of circular fringes which are called as Newton’s rings. These circular fringes of equal thickness were discovered by Newton, hence called as Newton’s rings.

Due to the increased proportion of the order of the ring, the Newton’s rings get closer to each other because they are not equally spaced. The path difference changes as moving away from the center but the change in the path difference is linear as moving away from the contact point between the plane glass plate and the Plano-convex lens.

Conclusion:

Hence, the Newton’s rings are closer together and farther from the center.