Aship is 130 m away from the center of a barrier that measures 180 m from end to end. what is the minimum angle that the boat must be turned to avoid hitting the barrier? (34.7o )

34.7 °

Explanation:  

Let ∅  be the required angle ;

For this angle perpendicular = 90 m and base = 130 m.

            Tan ∅ = 90 / 130 ; ∅ = 34.7°

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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