Optics Question 141
Question: In a Young’s double slit experiment the source S and the two slits A and B are vertical with slit A above slit B. The fringes are observed on a vertical screen K. The optical path length from S to B is increased very slightly (by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed, as a result the fringe system on K moves
[NCERT 1984]
Options:
A) Vertically downwards slightly
B) Vertically upwards slightly
C) Horizontally, slightly to the left
D) Horizontally, slightly to the right
Show Answer
Answer:
Correct Answer: A
Solution:
Vertically downwards slightly
