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The electron density of a layer of ionos...

The electron density of a layer of ionosphere at a height 150 km from the earth's surface is 9 × 109 per m3. For the sky transmission from this layer up to a range of 250 km,
Angle of incidence of this layer is

A

`34.5^(@)`

B

`25.2^(@)`

C

`31.6^(@)`

D

`40^(@)`

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