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In an interference experiment two parall...

In an interference experiment two parallel vertical slits `S_1` and `S_2` are used. A thin glass plate is introduced in the path of light from `S_1`. Then

A

fringe pattern remains unaltered

B

fringe pattern as a whole is laterally shifted towards `S_1`

C

fringe pattern as a whole is laterally shifted towards `S_2`

D

fringe width decreases.

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