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Which of these happens last?
Nina hits a drum.
Nina hears the sound of her drum.
Sound waves travel through the air.
The surface of the drum vibrates, creating sound waves. t

Sagot :

purifiwatery

Answer:

a concave lens is exactly the opppostie with outer surfaces  curving inward, so it makes parallel light rays curve outward or diverge. That's why concave lenses are sometimes called diverging lenses. ... The distance from the center of the lens to the focal point is, again, the focal length of the lens.

Explanation:

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