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A swimmer S inside water is vertically a...

A swimmer `S` inside water is vertically above a fixed point `P`. A rectangular glass slab `B` is placed between `S` and `P`. As been by `S`, the position of `P` will appear to change, if

A

`B` is moved horizontally

B

`B` is moved vertically

C

`S` moves horizontally

D

`S` moves vertically

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The correct Answer is:
C
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