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find the minimum colatitude which can di...

find the minimum colatitude which can directly receive a signal from a geostationary satellite.

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The correct Answer is:
A
The collattitude is given by `theta`
`ltOAB=90^@ltABO`
Again `ltOBC theta ltOAB` ltBrgt `:. Sintheta=6400/42000`
`=16/106=8/53`
`:. phi=sin^-18/53`
=sin^-10.15`
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