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Yogita Ingle 6 years, 4 months ago
When the light rays pass through the atmosphere having layers of different densities and refractive indices, then refraction of light takes place. This refraction of light by the earth’s atmosphere is called “atmospheric refraction”.
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Ram Kushwah 6 years, 2 months ago
secθ= cosec60
=cosec(90-30)=sec30 ( As cosec(90-θ)=secθ)
so θ=30
Now 2cos2θ-1
=2cos60-1
=2*1/2-1
=1-1=0
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Vishal Singh 5 years, 8 months ago
0Thank You