A glass cube of edge 1 cm and mu=1.5 has...

A glass cube of edge 1 cm and `mu=1.5` has a spot at the centre. The area of the cube face that must be covered to prevent the spot from being seen is (in `cm^(2)`)

`sqrt(5)pi`

`5pi`

`(pi)/(sqrt(5))`

`(pi)/5`

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