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In a Young's double-silt experiment the ...

In a Young's double-silt experiment the source slit S and the two slits A and B are horizontal with slit A above slit B. The fringe are observed on a vertical screen. The optical path length from S to B is increased slightly by introducing a tranparent slab. As a result the fringe pattern on the screen moves

A

Vertically downwards slightly

B

Vertically upwards slightly

C

Horizontally, slightly to the left

D

Horizontally, slightly to the right

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The correct Answer is:
A
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