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
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(a) Vertically downwards slightly |
(b) Vertically upwards slightly |
|
(c) Horizontally, slightly to the left |
(d) Horizontally, slightly to the right |
