Question

For Newton’s Ring Experiment:
(A) The condition to get constructive interference is 2nt = (m + 1/2),m = 0,1,2,..., where n is the refractive index of the film and t is the thickness of the film.
(B) The condition to get destructive interference is 2nt = mx,m = 0,1,2,..., where n is the refractive index of the film and t is the thickness of the film.
(C) The condition to observe the colored ring, the source of light should be polychromatic.
(D) The condition to observe the colored ring, the source of light should be monochromatic.
Choose the correct answer from the options given below:

• A. (A), (B), and (D) only
• B. (A), (B), and (C) only
• C. (A), (B), (C), and (D)
• D. (B), (C), and (D) only

Hint:

Polychromatic light leads to the formation of colored rings due to the different wavelengths that produce constructive interference at different points.

Answer 1

The Correct Option is B

For Newton’s rings, the interference condition for constructive and destructive interference is based on the thickness t of the air film and the wavelength of light. The pattern of colored rings can only be observed if the light is polychromatic, as monochromatic light will produce a simple fringe pattern without any color.