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Q. What is pair production and pair annihilation?
Pair production:
The conversion of a photon in to an electron-positron pair on its interaction with the strong electric field surrounding a nucleus is called pair production.
Pair annihilation:
The converse of pair production in that an electron and positron combine to produce a photon is known as annihilation of matter.
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Short Sightened OR Myopia: When a person can't able to see objects clearly but can see near objects clearly. This defect of vision is known as short sightedness.
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