Light in an optical fiber approaches the glass-air boundary at a 60-degree angle so that it is totally internally reflected. At what angle does the light reflect back into the optical fiber? The refractive index of the optical fiber is 1.45. Give your answer as a whole number to the nearest degree.

Depending on the surface area and weight, either can fall slower.

Explanation:

If you were to drop a feather and a brick off a building at the same height, the brick would reach the ground first. This is due to air resistance and how it slows the feather down compared to the brick. The surface area of the feather creates more resistance compared to its weight, therefore it hits the ground slower. It really all depends on the surface area, weight and the air resistance it creates.

If all air resistance were to be removed, then what would happen is that the two objects would fall and reach the ground at the same time. This is because the objects are in free fall, and because they are in free fall, the two objects would be falling at an acceleration of 9.81 m/s². This is true for all objects in free fall.

b. a lightning bug, plug of grass, and a worm