Which factor will affect the light-gathering power of a telescope?
a.
change in the focal length
b.
change in the diameter of the objective
c.
change in the angle of the objective
d.
change in the elevation of the telescope
e.
change in the type of lenses used

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

b.transmitters send radio waves, and receivers capture radio waves.

0.11 m/s and 0.28 m/s should be correct

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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