Question

In an experiment, white light is shone vertically down upon a convex spherical lens that is resting (curved side down) on a flat piece of glass. Which of the following statements correctly explain why there is there a dark ring at the centre of the resulting interference pattern? NOTE: More than one of the statements may be correct. To get full marks all correct and no incorrect statements must be selected Select all that apply: Destructive interference of two reflected rays occurs Destructive interference of the reflected ray and the refracted ray occurs Constructive interference of two reflected rays occurs cross out cross out cross out cross out cross out cross out O The thickness of the air wedge is equal to one-half wavelength at that location The thickness of the air wedge is negligible at that location There is a 180 degree phase difference (due to reflection) between the two reflected rays

Answer 1

These are Newton's ring. At centre dark ring is obtained because of destructive interference occur between remacted round two reflected ray occur. loption-I) Correct At that location distance between dens and glass plate is zero, so air wedge become negligible. Tortion - 5 When a ray is reflected from a denser medium , reflected say has a phase shift of 180. At this phase shif destructive Onterference Octur. option=6)