##
A diver at a depth 12 m inside water (a
_{
μω
}
= 4/3) sees the sky in a cone of semi- vertical angle

##
(i) sin
^{
-1
}
4/3

##
(ii) tan
^{
-1
}
4/3

##
(iii) sin
^{
-1
}
3/4

## (iv) 90°

**
Answer
**

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