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A beaker containing liquid is placed on ...

A beaker containing liquid is placed on a table, underneath a microscope which can be moved along a vertical scale. The microscope is focused, through the liquid onto a mark on the table when the reading on the scale is `a`. It is next focused on the upper surface of the liquid and the reading is `b`. More liquid is added and the observations are repeated, the corresponding readings are `c` and `d`. The refractive index of the liquid is

A

`(d-b)/(d-c-b+a)`

B

`(d-c-b+a)/(d-b)`

C

`(b-d)/(d-c-b+a)`

D

`(d-c-b+a)/(b-d)`

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    Acute angle
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    A
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