Question

If the air between Plano convex lens and a glass plate is replaced into water then Newton's rings:
A. Expands
B. Contracts
C. Not affected.
Answer with expanation.​

Answer 1

Answer:

C.

Explanation:

The diameter of Newton's rings is inversely proportional to refractive index. Therefore when a drop of water is introduced between the glass plate and plano-convex lens in Newton's rings, the ring system contacts. 

Answer 2

Explanation:

YOUR ANSWER IS C.......