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

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

A

`sqrt(5)pi`

B

`5pi`

C

`pi/sqrt(5)`

D

`pi/5`

Text Solution

Verified by Experts

The correct Answer is:
D
`r=h/sqrt(mu^(2)-1),A=pir^(2)`
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