Is the earth's gravitational force on the sun larger than, smaller than, or equal to the sun's gravitational force on the earth?

 The gravitational force is equal. We pull on the sun with the same force it pulls on us. It's just that the sun has so much more mass that it is barely affected. However, the gravitational FIELD of the sun is much greater than earths. 

Likewise when you're standing on the earth, you're both exerting equal forces on each other. You're pulling on the earth with as much force as it's pulling on you. 

iii or c. The light would pass through at an angle.

Explanation:

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