A glass cube of edge 1cm 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

A glass cube of edge 1cm and mu=1.5 has a spot at the centre. The area

1.	A glass cube of edge 1cm 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
Answer» `SQRT5 PI` `5 pi` `pi/sqrt5` `pi/5` ANSWER :D