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Atmospheric refraction causes starlight to bend, on average, in which general direction as it travels through the atmosphere toward an observer? increases closer to the earth's surface

Question
Atmospheric refraction causes starlight to bend, on average, in which general direction as it travels through the atmosphere toward an observer? increases closer to the earth's surface
Away from the normal, since the atmosphere is less dense than space
Towards the normal, since the atmosphere's density (and refractive index) generally
It does not bend at all in the atmosphere
Only sideways, never up or down
Answer
Towards the normal, since the atmosphere's density (and refractive index) generally
Detailed Explanation
As shown in the chapter's diagram, refractive index increases closer to the earth's surface, causing starlight to progressively bend towards the normal.
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