What best describes why the critical angle of an air-glass boundary is 39.3 degrees? The answer is D. It is the angle of incidence in glass for which the angle of refraction in air is 90 degrees.

I just made an account and can’t figure out how to respond to peoples questions haha.

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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 !

joke:

h o h o hope you have a merry christmas!