In an experiment with a rectangular glas...

In an experiment with a rectangular glass slab, for an angle of incidence of `60^@` in air, angle of refraction is measured to be `r_1`. When the glass slab is replaced by a hollow slab filled with water, angle of refraction is measured to be `r_2`. Then

`r_2=r_1`

`r_2gtr_1`

`r_2ltr_1`

cannot say

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