Two different between resultant and equilibrium

Firstly it is not equilibrium but equilibrant. resultant is a single force that can replace the effect of a number of forces, while equilibrant is a force that is exactly opposite to a resultant. equilibrant and resultant have equal magnitude but opposite direction.

d is the correct answer

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

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