Typically the rate of change of refractive index in atmosphere

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Typically the rate of change of refractive index in atmosphere with height dN/dn
approximately equals—

1. – 4.3 × 10^–2 m^–1
2. 4.3 × 10^–2 m^–1
3. 4.3 × 10^–2 m
4. None of these

Correct Option: A

NA