An object at a distance of 30 cm from a concave mirror gets its image at the same point. The focal length of the mirror is A) -30cm B) +30cm C) -15cm D) +15cm

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

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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i'm on my way to history not a mistory.